Scarlett's is generally regarded as having the hottest girls the area. It is smaller than Tootsies, but its not what I'd call small. If you go in when its slow, they've got two fairly large area's closed off but as it picks up they'll open them up. It used to be very consistent with a number of freakishly hot dancers every shift. My experience lately has been hit or miss as there's been a few visits where the girls were very average. Like Jack mentioned, its a bit more of a clubbish feel. Also as mentioned, Tootsies is maybe 10-15 minutes from Scarlett's, and Cheetah Hallendale is within 2 minutes of Scarlett's, and seems to be picking back up these past few months.
Tootsies is pretty big, and sheer numbers suggest you'll find what you want. It's also divided up so you've got the low end/high end feel in the same building. They've been cutting songs lately, prices for the girls in rooms can be a bit high, and you've got to be on the lookout for ROB's. At the same time, there's value to be had - just trust your gut and if you get a ROB vibe move on. Tootsies is the only one of these three where anything extra happens with any regularity. You'll have to arrange take out at the others.
As far as low end goes, there's a bunch of black clubs and various dives. IMO, they're pretty similar. They've all got the dollar parade (which you won't find at Tootsies, Scarlett's or Cheetah) and most have hit or miss dancers with a lot of 6's and the occasional diamond in the rough. I'm not that familiar with those joints, but if you move a very slight notch up I'd say Booby Trap or Pink Pony in Doral are probably the class of the middle of the road establishments, I've got a soft spot for Showgirls in Cutler Ridge too.
I always recommend Tootsies, its not the cheapest, doesn't have the hottest chicks, etc - but its versatile, reliable, and easy for out of towners. There's probably better places if you can establish a bit of a regular status, but anyone can score at Tootsies. Proximity to Scarlett's is a nice backup plan as well. If neither of those work, another 20 minutes north of Scarlett's and you can hit Cheetah Pompano, Booby Trap Pompano, Diamond Dolls, Club Pink, Pink Pony Pompano, and Porthole Pub all within about 5 miles of each other. The Pompano clubs are all smaller and more laid back/local feeling than Miami. Its much easier for a non spanish speaker to blend in too.