Personally I prefer slow with lots of tongue on the top. My wife does get carried away at times and while it actually gets me harder my mind (the one in my skull) prefers it less.
The key to great sex for many years is....don't find his favourite and just do that all the time. Mix it up. Try new things, even "invent" things (although there is nothing that no-one hasn't tried). You will learn new techniques that are better or worse for you and him and it's all fun.