I try to pick a drill that can drill into concrete / reinforced concrete for a non professional usage, say 1-2 holes a month. It is possible to choose between a combi drill (which usually has better torque) and a hammer drill (which usually has better speed and impact, many times torque is not even specified as if it's not important).
[Side Note: I prefer a combi drill so it can be also used for screwdriving etc]
Example of Combi Drill Parameters - Bosch GSB 18-2-LI Plus:
Max speed: 1900 rpm
Max torque: (1) 63 (2) 24 nm
Impact: 28500 bpm
Impact energy: ? J
Vibration emission (concrete): 13.5 m/s²
Example of Hammer Drill Parameters - Bosch PSB 650 RE:
Max speed: 3000 rpm
Max torque: 9 nm
Impact: 48000 bpm
Impact energy: ? J
Vibration emission (concrete): 35 m/s²
Questions:
What parameters (torque, speed, impact, impact energy, vibration emissiom) are more important when drilling into reinforced concrete? Since many hammer drills come with relatively low torque I figured that it is less important for drilling into concrete but when I asked a representative of Bosch via email he told that torque and speed are more imporant here which left me confused.
Does a higher vibration emission means a higher impact energy (in other words can one infer about the impact energy value by knowing the vibration emission value)?