Samplitude goes deep. It did back when I tried it. :)
So it all comes down to the reasons why you are looking for a secondary app. I use PT for compatibility reasons (Samplitude wouldn't help). Otherwise, there's nothing I couldn't do my main app and a decent sample editor.
In all honesty, I've used Cakewalk products, Pro Tools, Logic, Studio One, Harrison MixBus, and I've never ran into an issue that would have required tech support. Or then the occasional known bug - or a new one - but tech support can't really do anything about those - except confirm the bug.