yeah, depends on what you're going for.
I personally don't like board or heavy anything shields. Too slow and too heavy.
I go for anything with 90 speed or more. If its loomed, that's a different story though.
The knightly Kite shield is the strongest of the shields with 100 speed (by a small margin). That's why I use it. I also like the normal Kite Shield and the Brown Lion Heater Shield. Those only need 3 shield skill, and are tougher, faster, and cheaper than a lot of higher tier shields.
I've seen people do really well with the plate covered round, heavy round, heavy heater, heavy kite, and board shields though. BTW, why doens't it list slot usage on the shield equipment screen?