Which bike is better?

I am a complete noob and new to MTB, trying to get myself my first good used bike on FB Marketplace.

I am planning to ride in the UK. No crazy stuff like tricks and jumping but rather going on trails, in the countryside, to the mountains in the UK. I want the bike to serve me for about three years while I’m studying in university.

Have been looking and comparing different bikes, looking at reddit for suggestions and these are the ones that I found around me so far. Any advice is appreciated!

First bike: Norco HT1 2019, £250.
The guy says that all gears/breaks work, odd few scratches as expected but no cracks or dents in frame, needs about £100 work on it Hence the price.

Second: Rift Zone XC6 full suspension, 29 inch wheels, £300.
No comments from the guy, says all works as should.

Third: Scott Ransom 30 full suspension, £250.
Says that the pedal is broken. No idea how much could it cost and if that’s repairable.