Uesp has commands to fix quest bugs, BaseID to spawn NPC wars and even tips on the enchant/smith/alchemy synergy.
The other wiki has ... a mobile version. Exactly the thing for a console player to look up the solution to his current quest on his smart phone.
Don't you know that most of us console players are not technically saavy enough to know how to use a smartphone? That's why we play on consoles.
I can say this of course because I am a console player (both Xbox and PS3) and the only reason I don't play on a PC is because I am terrible with a keyboard and it would give me a headache to try to figure out how to get a controller to interface properly with a PC. My fiancee's iphone just gives me headaches to look at, I cannot imagine trying to use a smartphone to look up something on the internet. I miss the days when a phone was actually used to call people.
But yeah, I prefer UESP to the wikia by a long shot. The UESP seems much more reliable and overall more informative. Sometimes I will check the wikia on a particular subject after reading the UESP if I want a more complete answer.