I'm not sure I understand the question either but here's my 2c
I'd say Germany and Europe as a whole are more "available" when there are no local holidays. If you are looking to plan a trip each area seems to have its peaks or high seasons during the year. I've found fall a good time to go prior to the holidays but as long as you plan ahead you should have no issues using points. There's perhaps promotions you can cash in on that might give you a slight bonus but generally planning far enough ahead can sort that all out.
If you are thinking of a specific place and time let us know and maybe we can give you a little more specific advice on your trip
Generally redemption availability around Europe is excellent all year round, though New Years Eve may be problematic.
About the only issues with redemption in Europe revolve around special events such as football cup finals, or formula 1 races. I've always found redeeming in Europe very easy.