different substances have different effects on people , but i am also interested in the after-effects , i mean short term after-effects of these substances
for swim it ia as follows

cannabis - lets smoke one more , ya i am a habitual smoker
mdma - fucked up feeling continuing till a week , reason why swim did not take any for last 8 years and never will
ketamine - fucked up feeling from tripping till asleep , and a very bad feeling the next day for 5 minutes exactly at the same time , reason why swim never touched this shit more that thrice and that too 8 years back
alcohol - as fucked up a feeling as mdma continuing till the next day , reason why occasionally its acceptable to swim
acid - pleasant afterglow continuing till asleep
mushrooms - pleasant afterglow continuing till asleep
spice - pleasant afterglow continuing till asleep

and the favourites for swim are - cannabis , lsd , spice

swim has not yet experienced any other substance as of yet and still an amaetuer when it comes to spice with just a few experiences and still a long way to go , swim is young so a lot of time ahead if he does not die early

I always liked the afterglow I got from MDMA. For me it feels like I am still rolling, after the main trip/high is over it just feels like its mildly there, and I would feel that for 2-3 days afterwords. I've never had that shitty feeling most people get, I think my body just processes slightly differently, I also think my high dairy diet has something to do with it. I stopped doing it because most of the E in my area is just meth, and I prefer low doses of cacti anyway it feels almost the same.

MDMA and Cacti would have to my two favorites. For the reasons mentioned above, to me it feels like its still there, but significantly less and still a wonderful feeling.

Mushrooms are pretty nice as well, I've never had much of an afterglow per se, but I feel very refreshed and 'born again' afterwords.