I always find it ironic when avengers is put "vs" another pin. That's because their are "vs" modes in the pin.
I own AC/DC prem and AV Pro.
I'd love to help you out but you really can't compare these two pins. They are 100% different types of games. Layout is completely different, one is a mode based game, the other is a score based game.
AC/DC is a great pin. AVLE is a great pin too (once dialed in). This is truly one of those that you have to ask yourself what type of player you are and go down that route.
Or, if you aren't stuck on the Prem and LE you could probally get both in the pro model for about the same price. Both are better in the LE version's but both are still really fun in the pro version.
Really tough call on this one. If you look at my history you will see I had the same struggles. I wound up with both so I'm not going to be much help