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I have both a Tac Sol conversion that works for all gen (1 to 4, never tired on 5) Glocks as well as a Adv Arms conversion that is Gen specific (mine is Gen3 but there are Gen4). I used to hate my Tac Sol conversion kit for it is a jam-o-rama. But I found out that it is more an ammo issue for CCI 40 gr have no issue at all while the Federal 38gr stuff jams like hell on both my conversions.
Tac Sol feels more like a real slide since it is heavier but then heavier slides gives better feel but less reliable (in theory)
Both are easy to clean. Both have around the same mileage (around 4000 to 5000 rounds) Mags cost is about the same. Tac Sol mags has thumb nub you can use. AA mags require you to use the loader that looks like Glock's . Price is about the same too.
If I can only pick one I will stick with the Tac Sol since it works on all Glock Gen (1 to 4) by default.