Neither gun is going to be very easy to get these days, especially if you're wanting to purchase new.
If you are not concerned with gaming the gun, either will be fine. The PTW will fit a real VLTOR upper (not easy to get either) with minor modification. It also breaks down in a similar fashion to a real AR.
But, if you want the most realistic airsoft AR, you will need to look at a GBB M4 from Inokatsu or WE.
And, if you ever want to buy real guns, your time window is very rapidly shrinking. I have kids and many real guns. Within this year, all the nice, cool guns will become unavailable I'm afraid, and never be available again. And the ammunition to use in them will also disappear.
Age verifier Northern Alberta
Democracy is two wolves and a sheep discussing what's for dinner.
Freedom is the wolves limping away while the sheep reloads.
Never confuse freedom with democracy.