Are you looking for general skills improvement (Fundies) or mindset/awareness improvement (Rescue)? They both offer some of each, but the primary focus is very different.
So the obvious answer is both. But I'll offer a third suggestion if Fundies is too expensive or difficult to schedule. Book time with an instructor to work on whatever skills you think aren't up to par. You will have to do a little research to figure out an instructor that is a good fit, but as a rough first pass you can look for one that regularly teaches tech courses. And then take Rescue.
So the obvious answer is both. But I'll offer a third suggestion if Fundies is too expensive or difficult to schedule. Book time with an instructor to work on whatever skills you think aren't up to par. You will have to do a little research to figure out an instructor that is a good fit, but as a rough first pass you can look for one that regularly teaches tech courses. And then take Rescue.