Are SDS drills metric, standard or all the same

• 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.

As a remodeling contractor, I've owned both hammer drills and rotary hammers. The rotary hammers are frequently rated for drilling capacity by the diameter hole it can drill. Most homeowner chores can be accomplished by 7/8 to 1" capacity. You can drill larger holes, but at reduced speed.

There are 3 classes of SDS drills. The widest range of bits are in the "SDS plus" sizes. SDS max would be overkill.

I have and use an SDS-to-1/2 chuck adapter, which is rated for concrete drilling. I use it for the smaller sjzes only.

I would recommend getting a 3 function rotary hammer; - Drill only - Hammer only (useful with SDS chisels) and - Hammer + drill (my most used setting)