With the new creeps its sometimes better in solo que, in anything less than around 1800 ELO(which nobody from RB is really very close to), to farm/push cautious, and to farm drags mid game and then explode late game with what appears to be a slight lead(2-3 towers up, 2+ drags up, higher cs in general), which is actually a huge lead in gold and exp to win late game fights. In solo que late game, if you're playing a carry with no in built intiate(Flash-Tibbers, Flash-Sion stun, Ashe arrow, heck even Anivia wall), you MUST, unless you are a superfed snowball carry(Kass, Akali, etc.) rely on your tank who should be really tanky due to the multiple drags+cs/tower advantage your team has to intiate. If the tank doesn't initiate after a fight, there is quite literally no reason to fight. See that ward that reveals the 5 man enemy team at your red at 40 min baiting you. Hmm, if tank doesn't go and initiate to make sure you win, maybe keep farming and pushing ahead instead of fighting? Only reason to fight is to contest buffs/drag/baron/make it easier to push/try to stop other farmed team to pull ahead by keep on farming imo.
I'm only around a 1300-1400 player if that in normal, at 1000-1100 after bombing numerous games in solo que ranked, so take everything I say with a grain of salt.
Udyr is best jungler in game atm+he's super fun to play. In terms of my favorite character, its probably Kassadin, Amumu, or Udyr. Udyr is a very fun, very good jungler, who excels at the tanky dps+he's a good champ, while kass is a rofl champ who's, at this point, is pretty much untouchable past lvl 6 if you take cleanse+have mana, and Amumu is getting so much stronger lately its just nostalgia +funny stuff when you play him and land a max range bandage.