I don't really have much of an opinion on moving from IJ to Dreamwidth or not. Neither are my primary journal homes. Downtime seems to be more frequent on IJ than elsewhere, but it doesn't bother me that much. And there are possibly more people who have IJs than there are who've made the move to Dreamwidth? What with invite codes and all that. On the other hand, Dreamwidth allows for longer entries than LJ/IJ, which might make things easier for you (you had to host my fic last year because it was too long, but after the reveals I posted it at DW without a hassle. Not sure what the limit is, though).