While I do enjoy both, I've been more into wide toys than long ones, mainly because my tight spot at the entrance to the sigmoid (the "second sphincter" as some people call it) is stubborn and won't let much get past it. I've been able to fit a fairly slender 18" double-ended dildo all the way in. I have a couple other toys that are thicker but not too thick to reach into the sigmoid. I like to use the Bam dildo to open up my second sphincter, then follow it with the Rambone, which is narrower than Bam but firmer and more textured. Probing that deep feels good, but not for long as it gets worn out and sore pretty quickly. It feels like I hit a wall at 12"–14" unless I'm using a really soft and bendy toy.
In the past year I've been trying to push my limits with wide toys. I can take the Ass Servant butt plug which is 3.75" diameter at its widest. And I'm working on the Ream & Dream butt plug which is about 4.25" diameter. I still have a couple inches to go before I can sit all the way down on that thing. Meanwhile, the big stretch feels great. My toy sessions usually involve lots of hopping back and forth between Bam and Ream & Dream.