The trek probably not a lot, looks well used mid-low level component (STX) other than the rear mech, but that not going to alter a lot.
Full sus so any problems that come with old indiy fork and that rear sus setup.
The Scott, no idea looks nice, you'd need somebody that knows about this era of bike. Doesn't look so warn, lower end proper MTB groupset, but tidy looking.
Quick ebay type search shows 150 to 300 quid, if anyone bites.