This is the same for me; couldn't really get into the 6's and haven't tried anything larger than that. I find my 5 comfy enough and very versatile for many styles(church songs in Eb, Nu-metal in D or B, etc.); if I know it will be all pretty standard stuff I really enjoy my 4 though. I like my 4 a lot more for slap/solo stuff.
Ditto - I don't need the additional upper range a 6 string offers, nor do I want a neck any wider than my 5ers... Although I'm quite comfortable on my 5ers, my 4 strings are easier to play - they definitely seem like less work... I pretty much only play my 5ers when I need to go lower than D - if the music I'm playing at the time doesn't require noted lower than D, the 5ers stay home...
For most Eb stuff, I actually prefer to use a 4 string tuned half step down - I really prefer the sound of an open Eb on a 4 string over a fretted Eb on a 5er... It took me a few months to become "fluent" on a 5er, with more than a couple of frustrating moments along the way - but once I did, I've found it to be so much better than trying to get down to Db, C, and B - than trying to get there on a 4 string... I don't care much for the idea of a BEAD tuned 4 string, as I'm not willing to give up my G string for such a setup... I'm prefectly at home with 34" 5ers with necks that aren't too wide - EBMMs and Ibanez cover my 5er needs quite well, while Fender, EBMM, and Gibson handle my 4 string needs very well, too...
Anyways, use whatever gets the job done for you, I say...
- georgestrings
