FWIW, I had a 22wl and sold it here maybe a year ago. Still have an 05. My hazy and potentially wrong recollection is my 05 has better battery life since it doesn't have any wifi control. The thing about the 22wl that was interesting was the ability to control it remotely using the Tascam control app. If you had a situation where you could put the 22wl on stage and would be close enough to control it remotely, I think that would be its best use.
edit: alternatively, if you could put the 22wl at the soundboard and capture a feed remotely, that would also be a good use. I never tried it, but I assume you could use a battery powered external router to extend its range?
If you are just going to have the recorder with you, then my suggestion would be the 05 which I think is a pretty decent recorder.
The new Sony PCM-D10 looks interesting and comparatively much smaller than its predecessors.
The M10 was a classic. Still can't believe Sony discontinued it.