If you have a UTH on a thermostat you won't really see much difference by upgrading to heat tape, but that's just my opinion.
Heat tape is essentially just another type of UTH that can be cut to length depending on your application. It could be used in a viv, and I've used it for custom enclosures that I've built from bookshelves and such over the years. But more often than not I've seen it used for belly or back heat in rack systems. Mostly because, in that type of setup, heat tape is way more economical than standard UTH's like zoo med heat pads.
I use THG heat tape that I purchase from pangeareptile.com. The prices are reasonable and it's good stuff.