Okay... my 2 bits? I like them all but for different reasons...
SG1 - The characters, first and foremost, are your basic, modern day run of the mill soldiers who are constantly thrown into some very weird and sometimes extreme situations. The story is your basic save the earth from the impending aliens invasion type, but they pull it off in a way that makes it seem like it's really happening. Technobabble? Not here... They may start into what seems like technobabble, but they always end up with a simple, easy to understand explanation. Most memorable ep? The time loop episode... First time I saw that ep I was squirming on my bed with peals of laughter...
O'Neal teaching
Daniel how to read an ancient language?
B5 - The Story is this show's best feature, and with a 5 year continuous story arc that throws loop after loop at you, it shows. The characters are well done but some could be a little better done, not that I know how tho'. Technobabble, pops up from time to time but is never a major feature. Memorable ep? Too many to find a single one... Although, the ep where Sheridan tricks the League of Non-Aligned Worlds into letting the Rangers patrol their space pops up...
Farscape - Everything... Even though I've never seen the first ep (*begins ranting up and down the hall*), most of the charas are totally believeable and those that aren't are still somewhat believeable, and the story is well written and is also believeable (aside from the ones that aren't supposed to be). Technobabble is kept to a minimum and only used where it's needed to make the story interesting... Memorable ep? The failed starburst ep where moya ended up being split into 4 different realities...
Enterprise - Good episodic story and charas that could use some work (but we're only in the first season of this, so I'll let that slide), but technobabble runs the show more often than not, and when it does they tend to make it believeable mor often than not. Memorable ep? Two... 1) the chrononaut ep (cool CG imagery

) 2) the ep where a human freighter has been attacked by aliens but the freighter crew manages to capture one of them (real good story, plus I like it when you get a glimpse at the mundane stuff)...
So there you go... My 2 bits, whether you wanted 'em or not...
