I've actually had a six string (tuned standard), a six string (tuned B-B), and a seven string all at the same time before. The baritone was cool for some stuff, mostly if all I wanted to do was heavy riffs in the lower register.
My problem with it wasn't that I found soloing any different but I missed the high E string to get those shimmery chord voicings. I'm way influenced by bands like Dream Theater, Queensryche, & Fates Warning.
Almost every song I play or write has low tuned riffs AND complex clean arpeggios and chords using the high E has part of the tone. I could still do it with the baritone but it was a lot harder fingering those chords than necessary.
So for me, I sold all my other guitars except a lone six string Ibanez that I take on gigs for emergency string breakage use. I even tune that one in drop D just to justify it.
I found that I needed both the high E string and the lower tunings. It wasn't like I needed them at the same time but during the same song.
