Hey people!

I need some advise, I wanted to sell my Martin DXM (made in USA model ofcourse), but now this guy offered to trade his non-chinese EJ-200ce from Epiphone + 100$.

still waiting for further information on the acoustic!

I'd say you should try the epiphone out, find out which one you like better and see if it's in condition. They're different by brand, shape, woods, construction matters so you're going to get a totally different sound and feeling. I know the value neither of your guitar or the other guy's, so you should also consider if it's worth to trade them.
Neither is a "great" guitar. Instead of trading a decent, lower end guitar for another, why not just save up, trade it in, and get a level up in tone/quality/longevity/features, etc?
- Fender, Taylor, Martin, Ibanez, Ramirez, Marshall, Boss, Morley, Mesa/Boogie, Univox, Shure, Monster, Dunlop, Seymour Duncan, DiMarzio, Lace, Sperzel, DW, Tama, Zildjian, and a little Johnnie Walker