Computer and radar

Hi
I’m looking to get a bike computer to show me maps, distance, speed etc. At the moment I just use my garmin fenix 6 watch and it syncs with Strava but looking for something a bit better.
Been looking at the garmin edge range but wonder why people don’t use their phones? Are phones possible and is there a good reputable app that works on them?
Also been looking at a rear light radar that syncs with my phone or bike computer to show me when traffic is approaching.
I’m looking for some recommendations here so hope you can help?
I’m looking to get a bike computer to show me maps, distance, speed etc. At the moment I just use my garmin fenix 6 watch and it syncs with Strava but looking for something a bit better.
Been looking at the garmin edge range but wonder why people don’t use their phones? Are phones possible and is there a good reputable app that works on them?
Also been looking at a rear light radar that syncs with my phone or bike computer to show me when traffic is approaching.
I’m looking for some recommendations here so hope you can help?
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Posts
When I did triathlons I had a Garmin watch that I used for everything. Now that I mostly cycle, it seemed to make sense to switch to a bike computer - it's a dedicated unit, links with my HRM and other sensors if you want) easy to mount, easy to use, easy see and much cheaper than my phone if I do break it.
There is a Garmin light that has radar and connects to their head unit. DYOR.
I am not sure. You have no chance.
https://www.bikeradar.com/advice/buyers-guides/best-bike-computers/