These are my subjective experiences based on 20-30 lysergamide trips and large numbers of mushrooms trips. I haven't tried LSD, but LSZ, Al-Lad (screwed that up) and 1P-LSD. Etc-Lad tomorrow.
Mushrooms I find much more visual, both OEV's and CEV's. Honestly I find the visuals so overwhelming that all I do is lie back on the couch and listen to music and/or watch movies. I have to have playlists set up or tend to find myself unable to exercise fine motor control. Lysergamides on the other hand seem to lack an all encompassing visual aspect, but do lead to visual 'flights of fancy' (this may sound odd, but on 200 ug 1P-LSD my dog, instead of appearing to be a Golden Lab, looked like a reindeer with peppermint lollipops for ears). The visuals seem much more transitory and fleeting.
As far as introspection/mental/head/mind fuck - I find that mushrooms have it, but not lysergamides. When taking 5g mushrooms, I find it very easy to get deliriously, gloriously confused - occasionally standing in one position quite motionless because I can't figure out where I want to move to or what I want to do. So far I've remained quite clear headed on 1P-LSD, but have much more trouble walking. On mushrooms, I can stagger around like a drunk, walk right up to the wall and stare at the woodgrain for a long time.
Body load - I always feel nauseous when starting a mushroom trip, but this clears up when I'm peaking, or if I preload with something like Ranitidine. I've never actually vomited though. Mild chills and limited shakes. With LSZ or 1P-LSD I get quite cold, start shaking/shivering and have prominent leg shaking from about 25-60 minutes after dropping. Minor or non existent nausea.
Euphoria is constant, omnipresent and continuous on mushrooms; I've never found it with lysergamides (at all).
Mushrooms seem laid back, relaxing and quite sedating to me; I've got no problem sleeping after 5-6 hours. Lysergamides on the other hand, tend to keep me awake. I've heard them referred to as 'speedy'. I find them to be a perfect solution for my hypersomnia. I can't sleep on them, and this is quite okay with me. I'll take them at the end of a hellishly long day and know that I'll be awake for another 12 hours. On the other hand, I can be awake for only a couple hours after a 8 hour sleep, take mushrooms and be asleep again fairly soon, only to wake up tripping. With 1P-LSD there isn't a chance in hell of me sleeping even if I'm sleep deprived/depressed (which is all the time).
Bottom line is that I look at mushrooms as a 'happy drug' - something that puts me in a good place for a week or so. Lysergamides allow me to focus (does that seem weird?).
Tom
[edit; I've not yet combined the two or 'hippy flipped'(?) That's something I hope to do soon]