i like the stock NT's. but there's a few different ones.
the NT's that come with the fuel shut off are my faves. they're identical to the NT "Speed" carb, but they don't say "Speed" on them, they have a square black airbox instead of that ugly pink one, and for some reason they work better on my bikes.
that being said, i take the fuel shut off's apart, drill the banjo inlet all the way through, make a block-off plate where the lever used to be, and index the banjo bolt with the inlet. the fuel shut off's always end up leaking.
the older NT's with no fuel shut off are great maintenance free carbs, but they're smaller.
i've got a Mikuni 16mm on one of my bikes, and it's an awesome carb that works perfect on the bike, but for simplicity, you can't beat the NT.