What do all OSM editors have in common? They lose data and randomly crash, with rubbish error messages and horrible UI's
Potlatch 1 - So so slow, randomly loses changes and the flashing exclamation mark is too common a sight (although the live edit is awesome for checking how much, if any, of a failed upload has gone through - I hope this stays, if read only, in the future - also handy for checking what tags people have used).
JOSM - Can anyone really edit using this? So unintuitive, quality of background image tiles is dreadful, not to mention being java means it sucks up the resources of the computer like there's no tomorrow - one neat feature is the ability to break an upload into smaller chunks so a rejected change doesn't lose you everything.
Merkaartor - my personal fav (if only I could suss out how to use relations) but with the frequent crashes (although nowhere near as frequent as they were in recent releases thankfully) you end up having to save very frequently, and no Bing yet.
Potlatch 2 - been using this recently to improve some of my rubbish traces and add "private" stuff I've seen into the map, works reasonably well and just as I was starting to trust it I do my biggest edit yet with it, and guess what - yup a failed upload "couldn't upload data: 0 error #2032" - brilliant. And unlike Merkaartor's occasional failed uploads I can't export and try again later...
Sometimes I wonder why I bother.
(Can't you tell I'm annoyed with the latest crash - if only the uploading was quicker I would be tempted to do it much more often).