Canister. Cause I was going to need one anyways for my water filtering. So, I put disconnects on the in/out and can marry it to my fermenter, swap it back and forth ... with a thorough cleaning of course. Also, I would almost always be doing a pressurized transfer and filtering of fully or partially carbonated beer since I do pressure ferments. I like how 'closed' a canister filter is for that purpose. Doesn't a plate filter leak out the sides? I know that commercial ones tend to (that use filter pads) but that was OK cause it was never filtered after the brite tank, always before. But I carbonate in primary and I guess (not I know) that a canister might be preferable for that.
Having said that, I have yet to use my filter for anything other than water in a year. Cold crashing works great.