Well....speaking just from THIS SIDE of the rainbow.
I don't even look at the Tams-Witmark catalog because they still send "sides" - and with a community theatre production and inexperienced actors, you lose a week of rehearsal while they try to figure the damned things out. I have had a bad experience with their customer service representative but only because everything on the packing slip was NOT in the box. We were missing a score, but they didn't believe it, and we ended up paying for it. But I opened the box, and it wasn't there.
Samuel French sent some awful materials for The 1940's Radio Hour....there were scripts but NO vocal music scores...this was around 1992 or 1993, I guess and maybe it's different now, but teaching THOSE songs was fun! But their materials for LITTLE SHOP were GREAT!!! Go figure!
MTI has the best service representatives, the best materials (very user friendly). and they are very helpful if you have to schedule an additional performance or need extra material. Of course you pay for it, but it is always available. They also seem to know their material better than T/W.
But again that's just from my experience doing two musicals a year for the last 24 years.
Thanks for the findaplay website, DRJASON. I will pass it along to our Program Committee!