Display

Winner: Garmin Striker Vivid 7cv

This one is straightforward: only the Garmin actually has a display. Its 7-inch colour screen is the whole point of the product, giving you a proper on-water viewing area that is much easier to read than smaller units, especially in bright UK daylight or when you’re bouncing around on a windy reservoir. The Deeper Flexible Arm 2.0 has no screen at all because it’s just a mounting accessory. If you want to see fish arches, bottom contours, weedbeds, and bait marks at a glance, Garmin wins by default and by a huge margin.

Performance

Winner: Garmin Striker Vivid 7cv

The Garmin Striker Vivid 7cv is a complete sonar system, so its performance depends on the transducer and the unit’s processing. It’s made for scanning, interpreting structure, and helping you locate fish efficiently, whether you’re prospecting for carp on a large pit, finding drop-offs for pike, or reading rough ground for sea bass. The Vivid colour palettes are useful because they make returns easier to distinguish, which can help in stained water or when you’re trying to separate fish from clutter. The Deeper arm does not provide sonar performance at all; it only improves how you mount another device. So if “performance” means finding fish, mapping features, and on-water usefulness, Garmin is the clear winner.

Build quality and design

Winner: Deeper Flexible Arm 2.0

The Deeper Flexible Arm 2.0 wins here because its job is mechanical and practical: keep your fishfinder in a stable, adjustable position on a boat, belly boat, or kayak. A good mount matters more than many anglers think. In a small craft, a wobbling screen or awkwardly placed transducer can be a real nuisance, especially when you’re paddling to a margin, dropping a bait, or trying to keep an eye on sonar while fighting wind and current. Deeper’s arm is designed specifically for flexible mounting, which suits anglers who need quick positioning and a tidy deck layout. Garmin’s unit is well built and proven, but as a complete fishfinder it’s not designed around mounting versatility in the same way.

Battery life

Winner: Deeper Flexible Arm 2.0

Again, this category is about the nature of the products. The Deeper arm itself uses no power, so it has no battery drain and no charging concerns. That makes it the practical winner on battery life. The Garmin Striker Vivid 7cv requires power to run the display and sonar, so you’ll need a suitable battery setup if you’re using it from a boat, kayak, or portable setup. For anglers who are out all day on UK stillwaters or drifting for bass, power management matters. The Garmin delivers useful electronics, but the Deeper arm is the more battery-friendly option because it doesn’t consume any.

Price and value for money

Winner: Tie, but for different buyers

At £398.76, the Garmin is a serious purchase, but it is also a full fishfinder package with a 7-inch colour screen and sonar transducer included. For anglers who currently have no electronics, that price can still represent strong value because it gets you fishing intelligence straight away. The Deeper Flexible Arm 2.0 is much cheaper at £54.99, with a huge price gap of £343.77 in its favour. That said, it is not a substitute for a fishfinder; it is an accessory. So if you already own a compatible Deeper unit and just need better mounting, the arm is excellent value. If you need the actual fishfinding capability, the Garmin is the better value because it does the job on its own.

Features and versatility

Winner: Garmin Striker Vivid 7cv

The Garmin offers the complete feature set you’d expect from a standalone sonar unit: screen, sonar transducer, vivid colour palettes, and an easy-to-use interface. That makes it more versatile for anglers who want a dedicated tool for finding fish and reading water. It’s especially appealing for carp anglers on featureless venues, pike anglers searching for baitfish and depth changes, and sea anglers working marks from a small craft. The Deeper Flexible Arm 2.0 is versatile in a different way: it adapts a fishfinder to different craft. That flexibility is genuinely useful, but it is still an accessory rather than a fishing tool in its own right. On pure feature breadth, Garmin wins comfortably.

Overall user experience

Winner: Garmin Striker Vivid 7cv

If you want a complete, ready-to-use fishfinding experience, Garmin is the better buy. You unpack it, mount it, power it up, and you’re immediately looking at sonar data on a proper 7-inch colour display. That simplicity is ideal for anglers who want less faffing and more fishing, especially when conditions are cold, wet, or awkward on the bank or boat. The Deeper Flexible Arm 2.0 improves ergonomics and mounting security, but it only makes sense if you already have a compatible fishfinder to attach. For most buyers comparing these two listings directly, Garmin delivers the far more useful overall experience because it is the actual electronics package.

Overall summary: these products are not true alternatives. The Garmin Striker Vivid 7cv is the clear winner if you need a complete fishfinder for carp, pike, or sea bass fishing. The Deeper Flexible Arm 2.0 only wins if you already own a compatible Deeper unit and your main problem is mounting, not sonar capability. For a first-time buyer wanting the definitive answer: buy the Garmin unless you specifically need the Deeper arm as an accessory.