A hammer drill earns its keep the day you try to hang a TV mount or a floating shelf on concrete or brick and a regular drill just polishes the hole. The hammer action adds thousands of quick taps per minute while the bit spins, chewing through masonry that would stop a standard driver cold. For wood and metal you flip the collar back to drill mode and it behaves like any other drill.
Before model numbers, the real decision is the battery. A hammer drill is rarely your only cordless tool, so buy into the system you will grow with. Milwaukee's M18 and DeWalt's 20V MAX have the deepest lineups, Makita's 18V LXT is huge and mature, and Ryobi's ONE+ is the value king for homeowners. None of these cross. An M18 pack will not fit an M12 tool, Ryobi's 18V ONE+ batteries will not run its 40V gear, and Makita 18V LXT and 40V XGT are entirely separate platforms. Pick the family first, then the drill.
If you want the most power: Milwaukee 2904-20
The M18 FUEL 2904-20 is the one to hand a contractor. Milwaukee rates it at 1,400 in-lbs of torque with a POWERSTATE brushless motor and up to 2,100 RPM in high gear, and it will auger through dense framing or a run of self-feed holes without bogging down. It lives on the M18 system, so the same battery runs a saw, an impact, and 200-plus other tools. The catch is size and weight. It is a full-frame drill, not a featherweight, and the bare tool plus a high-output pack is a handful overhead. If raw grunt is the priority, buy this.
If you are deep in DeWalt: DCD999B
DeWalt owners should look at the DCD999B Power Detect. DeWalt rates its hammer drills in unit watts out, which is its own measure rather than in-lbs, so do not compare DeWalt's figure directly to Milwaukee's. The useful part is the battery story: a FLEXVOLT pack auto-switches to 20V to run this and every other 20V MAX tool, so one battery covers your whole DeWalt kit. It does not work the other way, though. A standard 20V MAX battery will never power a 60V FLEXVOLT tool. It is a full-size drill, so expect some weight.
If you want a compact high-torque pick: Makita XPH14Z
Makita rates the XPH14Z at up to 1,250 in-lbs of max torque in a compact 7-inch body. It runs on 18V LXT, the platform with the most cordless tools Makita makes. Worth repeating, since people get burned here, LXT 18V and 40V XGT do not share batteries. Do not buy XGT packs expecting them to fit this drill.
If you are on a homeowner budget: Ryobi PBLHM101
For most people drilling the occasional concrete anchor, the Ryobi ONE+ HP PBLHM101 is plenty and costs a fraction of the pro tools. The brushless motor puts out a rated 750 in-lbs, short of the contractor models but more than enough for shelf brackets, deck ledgers, and general home work. It joins the enormous ONE+ ecosystem, where the same 18V battery runs everything from a string trimmer to a shop vac. Do not expect it to drill big holes in old concrete all day, and skip any thought of fitting Ryobi's 40V outdoor packs, since they are a different system.
If you want light and compact: DeWalt DCD805B
Not every job needs a 1,400 in-lb monster. The DeWalt DCD805B is the compact 20V MAX XR hammer drill, in a short body that gets into cabinets and tight bays where the big drills will not reach. It is shorter than the flagship, which your wrist may notice by the end of a long day. It runs the same 20V MAX and FLEXVOLT packs as the DCD999B, so it makes a great second drill once you are already in the system.
The short version
Buy the platform before the drill. For maximum power it is the Milwaukee 2904-20. Already deep in DeWalt, take the DCD999B. For a compact, high-torque option take Makita's XPH14Z, and homeowners are well served by the Ryobi PBLHM101 without spending pro money. Match the battery to the tools you already own and you will be happier than chasing a torque number on a spec sheet.