Personally I think the two trees are well balanced now (certainly better than they've ever been), and tall is also now quite well balanced against semi-wide/wide (6 to 12 cities). For all that the speed enthusiasts say tall tradition is everything, you can make yourself into a real beast with 8 or 10 cities, and the wide science nerf has been good because it forces you to play more aggressively mid to late game if you choose that set-up, instead of turtling and letting victory come to you. The argument that liberty is only good for the first 100 turns while tradition benefits last all game is a bit spurious: if you save the liberty finisher, then a slingshot GE > Pisa > another GE > another wonder can be very powerful (especially in a mainly peaceful game), and the benefit from two wonders can easily compete with the long-term growth bonuses. Plus it makes sense to save the free GA until later in the game when you've got a few trade routes up and are rolling a decent amount of gpt, so you probably want to delay finishing liberty anyway. The main weakness I find in liberty is that you can't faith-buy late-game GEs without finishing tradition: that's a huge benefit whatever victory condition you're going for.