TO be simple : could I have a better relaxation mode with midazolam (tabs) rather than valium.
Or Midazolam is just to go to bed ?
In short, yes. Also, 7,5mg midazolam is equivalent to 5mg diazepam - so it's not a lot. It's a very short-acting, very potent hypnotic and amnesiac. It has poor oral BA as well, so if you're eating them, you're gonna wanna eat lots - 7,5mg oral midazolam is probably about 1-2mg oral diazepam. It IS a lot more heavy-hitting and sedating, but very short-lived, and with larger doses you'll pass out and not remember shit. If you have any tolerance whatsoever you probably won't feel a damn thing from 7,5mg oral midaz.
Apparently good in IV use for recreation (which I don't do) - orally it's basically a pill to knock you out to go to sleep. Rectal and nasal BAs are higher. It's generally a sought-after benzo, mostly because it's water-soluble and can be IVed, and it can produce a "rush" unlike most others.
I have tried it orally once - 15-22,5mg, I think, supplemented by alcohol - and it was quite relaxing, a little sedating, but nothing to write home about.
EDIT: Scratch that, 7,5mg is equivalent to about 10mg diazepam.
If you wanna relax, go with diazepam (although I personally don't like that either). Midazolam is either for knocking you out or rushing through IV use.