"Live & Loud" is my favorite. Pat Smear fattens up the sound nicely and they focus on "In Utero" material, which is generally my favorite stuff of theirs. And Kurt was apparently in a rare good mood and it comes through in his performance. I remember watching the concert on MTV back in the day. I like "Unplugged" but don't love it like most fans do. It's a good performance but Kurt was really nervous and his limitations as a singer are more obvious in that setting. And the power of Nirvana's natural plugged in sound was a huge part of their appeal so I miss it even if the songs are obviously still awesome.
There's some good stuff on "Muddy Banks of the Wishkah" too (like it more than I used to) but many of the performances don't seem like their best.