A year ago I would have said get similar guns. After spending many hours at the range and trying many different guns, I'd be inclined to say "get what you want". The basic skills translate no matter what the platform is and the nuanced skills are going to be specific to each specific gun anyway.
If you get two different types of guns you'll have a little extra spice to your range trips.
Heck, if I had to do everything over again, I might have put off getting a 9mm CZ and picked up a SW617 instead. I just can't get the dollar signs out of my mind with the centerfire. The Ruger Mark III gets 90% of my shooting time.