Don't go for any of these.
Why?
The Marlin 8 is old geo. The Roscoe is the only hardtail with current geo. Slack head tube angle, longer reach and steep seat tube angle. It's the only one Trek updated this year. The Marlin has quick release hubs from two generations back in time. 15x110 front thru axle and 12x148 Boost rear is current.
Discover your next great ride with Roscoe 7. See the bike and visit your local Trek retailer. Shop now!
www.trekbikes.com
7 & 8 have crap forks. 9 has a very good fork at a high price.
The other two are 27.5 wheel or 29.
29 gives you better rollover and handles quickly with good geo; The RockShox RL fork is easilty overwhelmed at speed and has almost no small bump compliance from the junk plastic Motion Control damper. Crap. You can replace the fork for about $500 for a Marzocchi Z2. Or about the same for a used Pike or Fox 36. So add that to the price.
A Ragley Big Al 1.0 hardtail has current geo, 30mm inner rim width wide wheels. And the best fork until you spend $1k for a fork. Marzocchi Bomber Z2. Get on the notification list at CRC and order immediately when you get an in stock email. You'll get the bike in 4 days. Free ship no tax.
Ragley Big AL 1.0 Hardtail Bike 2021 | Chain Reaction
Here's a review.