They're both a different brand, they both run off a different system.
The VSR-10 clone is absolute garbage, where the "ultimate sniper" is slightly less garbage.
If this is your first gun, I would advise against it, Sniping in airsoft is nothing like it is in video games. I've been using a bolt action for 2 years, and I only started enjoying it when I sunk $1000 worth of upgrades into my gun.
If you just want it to target shoot, get a pellet or a BB gun, they'll be much more accurate than an airsoft gun ever could be.
You should get age-verified and browse the classified and retailer section here, the stuff you can find here is MUCH higher quality (and not that much more expensive) than the garbage you'll find on public websites.