Your budget is probably a good place to start, plus how you want the bike to ride.
If you want the bike to be easy downhill and predictable (slower) handling then get some thing slack angled and generally longer travel. If you like fast handling ie good in singletrack and some thing that climbs well then steeper angled shorter travel generally.
I looked at quite a few 100-120mm bikes and ended up going for the Anthem X2. I wanted to really like the SC Superlight, but the Anthem blew it away from every respect.
The only bike I would have queried is the Canyon Nerve MR, but unfortunately you cant test ride them.
I used to ride a 130mm bike and the Anthem rides the same stuff just as well, in fact better and I really dont think I’m on 100mm most of the time.
This was my original list:
SC Superlight
Cube AMS 110 SL
Giant Anthem X2
Lappierre X Control 410
Trek Fuel EX 8
Canyone Nerve MR 8.0
Canyon Nerve XC 9.0
Scott Spark 35