We use several, depending on what's cooking. For general table use and for anything Sparkly's gonna be eatin' we use the pride of New Iberia, Loozyanna, the original Tobasco. I like the flavor (apart from the hot). I've many similar ones but come back to this.
Of about similar hotness is this one. As I type this, I'm not sure if it is Vietnamese or Thai. It is sweeter than the Tabasco and has a nice flavor. I get it at the Asian store, where there's a dizzying array of similar products (some of which look pretty scary to my untrained eye).
When we want very hot (my sons and I eat this, Sparkly and Sparkly Jr won't go near it) we use Peppa-Po, which is essentially pickled crushed Scotch Bonnets. We often add this to Pad Thai. It is essentially quite sweet once you get past the hot and seems to go very, very well with the lime and chopped peanuts we put on our Pad Thai.
This is the coup de grace ..... a concentrated capsicum concoction that is hotter than any natural sauce. It says on the label to use caution, but that may well be marketing hype. But it
is hot!
There used to a stall in one of the local marketplaces that sold only hot sauces. They had one special type that was sold in a sealed clear cylinder. Inside that was this jar that looked more like a chemical jar than a hot sauce jar. It was super concentrated capsicum at the top of the "hot" scale (there is such a scale, but the name escapes me at the moment). The instructions said to add only a few
drops to a gallon of whatever it is you're adding it to! It also had the universal poison sign, the skull and crossbones, on the jar. I asked the clerk if this was hype (it was an otherwise very "anti hype/anti marketing" type label) and he said no. If eaten by itself it could literally be toxic.
I left that on the shelf.