What are the differences between SDS, SDS Plus, and SDS Max drills?
The SDS chuck system was the original developed by Bosch.
SDS Plus is an improvement on the original SDS system, but remains
compatible with SDS bits, and is now the most commonly seen on the
market.


SDS Max is designed for the heaviest masonry work, and is
incompatible with SDS/SDS+ bits.


(source: wikimedia.org)  


https://en.wikipedia.org/wiki/Drill_bit_shank#SDS_shank

It sounds like for your application, SDS Plus would be the way to go, given that they are generally less expensive, and you don't have really tough masonry work to do.