Won 2 bikes what should I do?

Hey all,

I recently got back into mountain biking.
I bought myself a Trek Marlin 5 Gen 2 for around $600 CAD.

Last week I won 2 bikes at auction for $438 CAD. Makes me regret buying my Marlin 5.

The first is a brand new Trek Marlin 6 Gen 2. I'm assuming I already got my money worths just with that one.

The other is a Rocky Mountain but I'm not sure what model it is and looks like it's been modified. Wondering if some people could help me estimate the price? At first I thought it was a Growler but it has a skin wrap on it. Only has rear brakes and specialized down hill tires. The rear wheel also has a weird pin that i don't know how to inflate.

I don't want to keep it unless someone tells me it's much better than the other 2 I have.

Attached some pictures, help would be appreciated.