Personally I think Florida diving is less interesting than most destinations in the Caribbean,
I have far less dive experience than you. I dove 20 dives in a week out of Key Largo, and 17 dives spread over 2 separate weeks/years out of Jupiter vs. 8 weeks in Bonaire, a week each via live-aboard in the Caymans and Belize, land trip to St. Croix and a smattering of cruise ship stops. My anecdotal thoughts:
1.) Key Largo diving was fishier and larger than Bonaire. In Bonaire, I might see a school of French grunts, in Key Largo a school of blue-striped grunts, and KL had more large barracuda and more decent-sized grouper (and more species; black and Nassau, even Goliath if I did deep wrecks, vs. just tiger grouper I saw in Bonaire). But Bonaire had better viz. (maybe 50' vs. 75-100'), and shore-diving
rocks. KL's shallow reefs over hard bottom; offered good lighting for photography; Bonaire's sloping reef wall is often as deep as you want it to be.
2.) The Caymans (mainly Little) & Belize probably had more large grouper (but not Goliaths!), closer encounters with reef sharks, and definitely better viz. Plus deeper average & max. depths on the guide-led dives (ignoring Key Largo wrecks).
3.) I enjoyed St. Croix a lot, but I'm gonna give Key Largo the nod on fishiness. St. Croix had some shore diving, nice sandy beaches and a more interesting topside in my view.
4.) Jupiter, FL part of the year offers reliable lemon shark encounters, and another part of the year aggregating Goliath grouper encounters. If you're willing to join dives where the leader hand-feeds fish chunks to sharks, then lemon, bull and tiger sharks can be seen in close-quarters, and I hear hammerheads, too. Granted, you could head to Tiger Beach off Grand Bahama where I hear some of the tiger sharks tend to run larger (near 10 feet was big enough for me, thanks), or dive with great hammerheads (off Bimini was it?) or even seek out the Oceanic white-tips off Cat Island, but my point is, Jupiter's got some rocking shark diving on offer.
And that's not even considering the west coast FL diving (which I haven't done), the spear fishing done out of Florida (how many Caribbean destinations let you do that, I wonder?), and the fresh water options (e.g.: springs & caves) for some.
I can't say definitively who's got the most interesting diving, and interesting is in the eye of the diver, but I think Florida is at least competitive with most other regional (e.g.: U.S. & Caribbean) warm-water offerings. I'm not talking coastal California (cold, keep, seals & sea lions), Sea of Cortez & other Pacific sites, etc...
Richard.