If I get 3Play from Unitymedia for 35€,
Correct me if I'm wrong, but as far as I know, you pay x € monthly (5-10?) for the "cable connection." This gives you digital TV via cable.
If you then book 3Play with HD+, you get telephone, internet, and HD channels included.
If you don't pay for a "cable connection" and get 3Play, it could be that you have internet and telephone, but I believe you then can't watch TV, neither digital nor HD.
A satellite connection is a one-time payment! Cable connection is monthly.
HD probably costs about 5€ extra on both, so you can exclude that from the consideration.
You should best inform yourself first.
Everyone has unanimously said so far that you should at least prepare the SAT. You asked here for that advice, right? Seems like you’d rather want to hear something else.
And if preparing is supposed to cost 500€ or 1000€, then take a grinder in hand, chisel a slot (hammer and chisel) from top to bottom and lay an empty conduit in it. I just did that at our place on Friday, it took about 30 minutes, the empty conduit cost about 10€, only the cable and the socket (100€?) are missing.