I really only remember the early seasons, lol, with a few brief moments of the later years. I'm not sure if I'd like that more or not.
My guess Is you'd prefer the earliers season, and from those seasons you'd prefer the episodes that focused on one or more of the kids. That just an educated guess though, based on the kinds of FH episodes you like the best.
I didn't even recall the dropping of Randy, leftturn. I don't really have much of an opinion on it, but it usually throws you off when something like that happens on a series.
They wrote Randy off the show in the last season by having him go on a study program to Costa Rica with his girlfriend, Lauren.
The last season went downhill from there. They introduced a plot line where Tim's brother Marty breaks up with his wife, and Marty and his two daughters move in with the Taylors. Then when Randy comes back from Costa Rica for Christmas, Marty's two girls are living in Randy's room and everybody seems to be ignoring him. After that Marty and his girls did move out, thankfully.
They had some other multi-episode story lines in the last season as well, most of which didn't do much for me. There was the plotline with Jill finishing up her master's thesis and presenting it to her professor, getting her master's degree in psychology, and being offered a job at her professor's family therapy clinic in Indiana. There was the plot where Al gets engaged to a wealthy woman electrician named Trudy, and gets married to her in the Taylor's back yard in the last episode. Then there's a plot with Brad, now a college bound soccer obsessed jock, getting injured during a soccer game and having to go through rehab. Finally, there's the plot where Binford appoints these two younger guys to manage Tool Time, and they make so many changes to the show that Tim decides to quit. Which leads to Tim and Jill deciding in the final episode to move to Indiana so Jill can take the therapy job (Tim figures out how they can move their house to Indiana with them).
Of those plots, the only one I really liked was the one with Jill finishing her psychology major, although I don't like the ending of the series where Tim and Jill decide to move the family to Indiana.
The final season still had the odd episode that was really good. There was one where Tim takes his car to a female mechanic and starts spending a lot of time at the mechanic's garage, not because he's having an affair, but because he's obsessed with the work on his car being done right. Tim doesn't tell Jill that his mechanic is a woman, because he doesn't think it's important. I don't remember how, but Jill finds out that Tim's mechanic is a woman, and she assumes he's having an affair with the mechanic. It's abouslutely hillarious.
Mostly I prefer the early to middle seasons over the late seasons, although season 1 did drag a bit as well. So I preferred seasons 2-7 over seasons 1, or seasons 8-9.