You'd hate UK diving - cold, crap viz and loads of entanglement. The North sea is like diving in mud.I hold TDI and IANTD technical instructor certifications with all the specialties. All overhead environments present challenges, but there are plenty of very friendly caves and plenty of very deadly wrecks. There are seemly serene dives that are quite dangerous if you do not make the proper preparations. You can't blanket statement anything. You have to take into consideration tides, currents, entanglements and gear snags, seam squeezing, depth, visibility, temperatures, profiles, gas switches, all of it. Nothing is dangerous if you know what you are doing. Everything is, including a 20' reef dive in warm, clear water, if you don't. It's like anything else. Proper prior planning, emergency procedures, and keeping your cool.
Speaking only for myself, I'd rather dive an unmapped cave in Florida than many of the cold water, East Coast wrecks that are popular with the technical crowd like the Andrea Doria, The Oregon, and The San Diego. The Andrea Doria in particular is a mincer, and is dangerous as hell because of the depth (the good stuff is at the bottom), current, notoriously low visibility, and how many entanglements are lurking everywhere (including fishing nets and heavy commercial fishing lines from people fishing the wreck). I did it once, as a young man and don't care to do it as an old one.
That said, Scotland is at least clear, and the whiskey is warming when you dock.