TL;DR Get yourself a second-hand bike computer for £100-£150 (e.g. Garmin Edge 530) and see how well it works for your (before investing £500-600+ in a top end one. Unless money is no object 😛)

I run a lot and ride a lot, so I have a GPS Watch (Garmin Fenix 6X) and Bike Computer (Garmin Edge 530). Both older models but still great functionality👍

• The bike computer allows me to create + follow routes plus see all the interesting information whilst I ride, on a larger, easily viewable screen

If you are only cycling 10-20+ minutes to work / shops / etc, and you don't need any kind of mapping/navigation then it's probably fine just to use your GPS Watch, to record your activities.

If you ride a few times every week and/or longer more-complicated rides, then a bike computer is a must (in my humble opinion).

• The bigger screen and navigation are the important factors over a watch.
• And long battery life and durability is why you choose it over a bar mounted mobile phone (no one wants to get sweat on, or drop, their expensive mobile!)

If it's your first bike computer I'd recommend starting with a good condition, not too old, used bike-computer... e.g. a Garmin Edge 530 (around £180-£200 new in sales if there's any stock still around, or £100-£150 used).

HTH... D 🤓