It matters for rotational mass (gas mileage, acceleration, braking) and for unsprung weight (ride quality).
The lighter the wheels and tires the better.
Aluminum is the way to go, IMO. Aluminum can be black (anodized or painted).
Also, a 16" wheel is signifigantly lighter than a 17" wheel.
A 15" wheel is signifigantly lighter than a 16" wheel.
A 7" wide wheel is signifigantly lighter than an 8" wide wheel.
A load C tire is signifigantly lighter than D or E.
C also ride much nicer. C are plenty tough enough for off road on a 1/4 ton Jeep.
AT are usually lighter than MT. AT have less rolling resistance than MT.
Warning: I often edit my posts a few times to get them complete, or to correct errors.