You should take individual supplements so that you can control how much of each you take, and to avoid the things you don't want to take. I do take B50 supplements though, which have 50 mg of each B vitamin(but much less of B12, folic acid, and biotin).
I take regular Coq10 as it is expensive enough. I don't think ubiquinol is worth the extra cost. Acetyl l-carnitine is a good supplement, especially if you have cognitive problems. If you don't have cognitive problems, you might want to take the less expensive l-carnitine instead. I guess 100-200 mg a day of COQ10, and 1,000-2,000 mg carnitine a day seems reasonable.