Question about Garmin fenix 7X Solar

As I don't know the Garmin Fenix 5, I can't answer competently,
Just this much: after several trail run races with Fenix 7X over 50-100km with hours of running in the pitch dark following a GPX track, I can say that the GPS is tremendously accurate, even when the wall is extremely steep (normally the accuracy decreases the more vertical the terrain is). The battery power is easily sufficient for long ultras.
Also in terms of biometrics, heart, breathing, sleep, etc.
The performance of the accelerometry is amazing: I look at my watch in the pitch dark and the display lights up immediately. During muscle training, the accelerometry recognises which muscle groups have been pumped, approximate weight/sets/reps.
Even after using it for over a year, I'm still amazed. I actually got a lot more than I expected before I bought it, and that rarely happens to me.

I did not, as I had used the watch once and then put it away properly and only wanted to use it for holidays, but it could no longer be operated after 1/2 year. I sent it in with a more expensive strap and then after 7 weeks and several enquiries I got a refund of the purchase price the new strap was gone. I am not convinced by the watch and the warranty procedure.