If you are going to dive locally (German lakes) buy the drysuit. If you are going to do mostly travel diving, a wetsuit is reasonable. Traveling with a dry suit will include the suit, undergarments, a weight system, like a DUI harness though you will be getting the lead at your destination. A wet suit will pack smaller than a crushed neoprene suit and all the accompanying toys. An no ever had to abort a tropical dive because their wetsuit was leaking at the seals....
Wet suits have some advantages over a dry suit because the amount of lead you need will be significantly less and controlling buoyancy is inherently simpler. If you are never plan on water below 15C and not expecting to go deeper than 20 meters, a 7mm may be fine. I like diving in warm water with a wet suit. My dry suit extends my dive season considerably, but it was a significant investment.