tren ace = faster acting (more pinning: ed or eod)
tren enan = slower acting (less pinning: 2x wk)
tren ace is liked a lot more typically and is a smarter route to go if it's your first time using tren because of hte fact that if you develope sides, the ace ester will clear from your system more quickly.
the diff. is the esthers....yea it sucks inj. ed but the sides will be less harsh doing it that way b/c you blood levels will be more stable...they both work, i prefer ace/prop...fast acting