Little (1-9/16) SDS or big Brute Breaker

Okay, an upcoming job will allow a purchase of a tool I’d had to rent until now.  All discussion of undercapitalization aside, give me your input on the following choice.

I’ve gotta break out old portland cement concrete with some accuracy across a 25′ run in a basement for new DWV lines.  I do this maybe once a year, so a if its a little more tedious to use a big SDS vs. a breaker hammer that’s probably okay.  But I emphasize the words “little more.”  More often I need a rotary hammer that packs more punch that my Milwaukee hammer drill to takle jobs like boring small holes in concete for redheads and the like, which is why I’m considering settling in the middle with a big SDS. 

The question is, can the light-weight SDS do the occasional breaker job with enough reliabilty and not a whole lot of extra effort vs something like a 90 lb. Brute Breaker, or will trying to use it for that role rattle my fillings out before I even get halfway done?