George, I would suggest that before you make either base gravy, you at least once try the Balti cooked from scratch using basic fresh ingredients. The recipes and method shown by Shababs and Rishton chefs are all but identical and I found it to be very quick, easy and affordable as well as producing a nice dish. You might instantly recognise it as the Shababs Balti you've already tried.
If you then feel inclined to make the base gravies, be aware that they are quite different. Misty Ricardo's gravy is well spiced while Mick's is the opposite. Misty Ricardo's Chicken Balti (using gravy) is similar to the fresh ingredient dish but more spiced.