Theta:
I prefer 5-MeO-DiPT to 5-MeO-MiPT when they are taken orally myself, though our alters are not all in agreement on this, and we've only taken 5-MeO-DiPT once so far. I'm particularly sensitive to the psychedelic effects of 5-methoxytryptamines though and thus find it easy to find things about them to like or to latch on to for comparing and contrasting. We recently had an experience smoking 5-MeO-MiPT that I very much enjoyed but we haven't smoked 5-MeO-DiPT for me to be able to compare them in that way.
5-MeO-DiPT reminds me more of LSD than 5-MeO-MiPT does, which is relatively more alike mushrooms by comparison, though I would say they're both more alike LSD than mushrooms, and more alike mushrooms than LSD. Both 5-MeO-MiPT and 5-MeO-DiPT are notably more similar to one another in some obvious ways than the step in between them, 5-MeO-EiPT, is to either for me, so I think there's some chance that someone who likes one may still enjoy the other that has more to do than just with them being 5-methoxytryptamines, but I wouldn't say it's a given.
For me, 5-MeO-DiPT has come out on top so far because even though we've only used it once, orally at 10 mg, the trip rapidly came crashing in with an immense yet rather calmly dissociating euphoria that definitely surpasses the other 5-methoxytryptamines, exploded into rich and colorful geometric imagery filled with cartoony visions similar to LSD, and produced a very analytical and energetic headspace that I felt was insightful without being too forceful, and the body load was very low until the much later hours of the day when we started experiencing things like head and neck tension. We felt high for something like at least fourteen hours, though by the end mostly in terms of the mental stimulation still going. The sexual effects didn't make themselves known without provocation but were apparent when searching for them and definitely stronger than 5-MeO-MiPT's, though I also found them kind of animalistic and even desperate compared to the more standard euphoric psychedelic sexual edge I find in 5-MeO-MiPT, and I may have to say I do prefer that specifically about 5-MeO-MiPT so far, but it probably wouldn't be my first non-5-MeO-DiPT psychedelic choice for sex nonetheless.
I've enjoyed 5-MeO-MiPT the times we've used it, but it so far seems to me like it has more classical psychedelic flash but less cerebral drive, and I haven't really been able to take the former far enough with it to make it as memorable for me in that way as 5-MeO-DiPT has been in its own way so far. Most of the time we take it the other alters are out more than I am seemingly because they get more out of it than I do, but I enjoy it through them, and them getting something out of it is also me getting something out of it (since we're the same human being). It so far seems to me like they've gotten a good amount of introspection leading to releases of tension out of it, which some of them are now agreeing with internally. I wouldn't be opposed to getting that sort of use out of it myself, but just have gotten that more from other substances so far, but I'm not pushy about it. When we take 5-MeO-MiPT orally we feel it for at least like nine or ten hours I want to say, though similarly to 5-MeO-DiPT it's quite subtle by the later hours. The body load isn't terrible but we've had worse on 5-MeO-MiPT at times than on our one 5-MeO-DiPT experience so far.
There's a fairly even split in the number of alters in here who prefer 5-MeO-DiPT to 5-MeO-MiPT and vice-versa for what it's worth, so in the end I'm guessing it's more so just one of those things you'll just have to try to see which way you swing.