Agreed on the benefits of the baffled technique. I mostly like unbaffled A-B spaced omnis up close, like along the stage lip, & not only two channel but often 3, 4 or 5 mics spaced about 3'-4' between each. Otherwise, I run a pair as outriggers to augment a center coincident pair for outdoor shows farther back.
But for simple two mic stereo using omnis, I also prefer the results when using a baffle. If you are into experimentation and DIY, the typical jecklin-disk stuff is a good start and there is plenty of info around here about it. But you might also consider two individual baffles- one for each mic, which allows alot of flexibility in spacing between mics, spacing from each mic to baffle surface, and the ability to angle the baffles forward. I've been digging baffled omnis spaced about 18"-20", with the mics mounted right on the baffles.