Well, I haven't seen the latest (currently beta) stuff but some quick
off the cuff remarks:
Both vendors seem professional and commited to developing a good product.
Lucids compiler seems to produce faster code. Possibly you are sacreficing
debug, but I haven't worked with them both enough to say for sure.
A big big factor for us: Allegro (Franz) will sell you the source code.
Lucid won't. That pretty much prevents us from getting Lucid. (sorry L/Sun).
We develop too many local debugging hacks to be able to live without
source...