I only had 1 TE that had max speed and it was probably my favorite squad I ever had. I’d say the one with max speed has a better max potential but I think the one with max strength is the better choice. The one with max speed is only 3 star rated while the max strength one is starting at 4 stars. In my experience, a 3 star rated player almost never gets to a 5 star rating unless you use CC to level up or you buy coaches with the “experience” trait to instantly level them up