Griddles: There are two types of griddles, electric and gas griddles. In general, gas fuel costs are less expensive than electric. While both modes require a warm-up time, gas griddles will usually reach their optimum temperature quicker. However, whether you purchase a gas or an electric griddle, both have thermostats that control the heating elements and keep the surface temperature consistent. 

Ranges fill a very broad category. They come in many different sizes and many different combinations of elements, all designed to give you the greatest flexibility in the smallest amount of space. In the restaurant ranges, we encourage casters and quick disconnect packages were applicable.  Medium Duty Ranges are generally more versatile and come in various widths from 24" to 72", whereas Heavy Duty ranges are generally 36" wide. A lot more combinations can be built into the medium duty range. Durability is the primary reason an operation would purchase a heavy duty range. In a hotel or high-volume operation, these units need to withstand the weight of heavy pots....

Gas versus electric fryers.
Whether gas or electric is more economical is a controversial question depending on the energy company you talk to. Generally, gas-operated fryers are less expensive to operate and have a quicker recovery time. They're also hot the moment you turn them on, whereas electric equipment always involves a "warm up time."