Should I buy the eufy C15 or the E15?

Buy the eufy C15 Robot Lawn Mower for a small, level lawn where noise and price matter most, and the eufy Robot Lawn Mower E15 if your lawn is bigger or you want 4G and app-controlled cutting height without extras. Both use cameras only, with no wire or RTK station, and both share the same slope limit of 32.5%.

The main differences, from eufy's specifications:

• Lawn size. The C15 is rated for 500 m² and the E15 for 800 m². We'd treat about 400 m² and 650 m² as comfortable working sizes.
• Cut. The C15 cuts 180 mm wide against 203 mm. Its height is set with a knob on the mower; the E15's is set in the app.
• Noise. Measured sound power is 58.2 dB(A) for the C15 and 66.3 dB(A) for the E15, a clear gap.
• 4G. Built into the E15. On the C15 it's an optional plug-in module, and without it there's no GPS theft tracking.
• Obstacles. eufy says the C15's TrueVision system recognises pets and small animals.
• Garage. Included with the UK E15; not confirmed for the UK C15.

Prices start from £999 for the C15 and £1,159 for the E15, and eufy discounts both often. Once you add the C15's 4G module, the gap narrows, so compare the total you'd actually spend. Neither suits steep gardens, and both carry the same two-year warranty.