Interesting quote from a friend: "LSD is your teacher, mushrooms are your ally."
You will hear different reactions from different people, but.. I find LSD intensely insightful and introspective.. besides the synesthesia.. thought patterns, words and phrases trigger distant memories, memories intertwine with other memories.. connections form that you think about for a long time afterwards. There is a reason Hofmann felt it was better for psychiatric use above all other psychedelics. LSD definitely has its own spirit and you can find it especially on stronger trips if you have no distractions and just float away into the trip. And once you find that spirit it is easier to connect with on future trips (so i found).
Some people claim to find mushrooms more insightful though. I can't say as I haven't done mushrooms enough to compare. Probably everyone is different.. in any case I hope you have a good blotter and wish you a great first trip!
(Anyway if you think about it, LSD does come from fungus as well, sorta!)
As to your other question.. most acid floating around these days is pretty weak (so i hear), I doubt one hit will be as intense as 5g of shrooms unless you are really lucky and got some goooood blotter
I know a few mushheads who tried acid a couple times, got some lousy weak acid and never had much of any experience at all and gave up. oh well.