Specifications help once the type is clear.
Voltage (V)
Roughly indicates the class of the battery system — not automatically the quality of the work. A higher voltage is no guarantee that a tool is suited to concrete.
Battery capacity (Ah)
How long you can work between charges. For household jobs a compact battery is often enough; for longer sessions Ah becomes more important.
Torque (Nm)
Important for driving screws and for heavier loads. It is not the first question if you do not yet know the type.
Speed
Affects how drilling feels in different materials. In practice, control and the right bit often matter more.
Chuck
A standard chuck takes typical round-shank bits. SDS is for rotary hammers. Do not mix the two systems.
SDS
SDS is not “a better drill”. It is a rotary hammer system for concrete. An SDS bit is not the right partner for a standard drill chuck.