Basically anything is good! Regular old salt, pepper, garlic is always tasty; different herbs; those pre-made blends work well, too! I just kind of grab whatever sounds good out of the spice cabinet.
They withstand the pressure cooker better, being firmer then the others. Browns would do okay, but might fall apart a bit. Gold/yellow potatoes would definitely fall apart.
Thinking about it, you might be able to do it with sweet potatoes, but that depends on the sauce, really.
If you search for "ocean of pdf madhur jaffrey instant indian", the first result should be a link to the PDF of the cookbook. Everything I've made from this book has been fantastic, so I recommend buying the book if you like this style.
1/4" slices spread in a pan with butter on high medium heat, adding water 1/2 up the slices. Cover with black pepper and savory, maybe a little thyme, some chili flakes if you like, and a good amount of thinly sliced shallots. Cover until the potatoes are mostly soft, and remove the cover. Once the water evaporates, cook until the potatoes are fairly browned and flip. It's perfectly ok for them to break apart some, but try to minimize it. Once the second side is nicely browned, deglaze with brandy. Flip one last time as it evaporates.