are ladies comfort bikes harder to pedal?

I have a mountain bike and I am looking for a more comfortable bike to pedal. I have checked out the comfort/boardwalk bike at walmart but it only has 6 or 7 gears and larger tires. Are these bikes more difficult to pedal since they only have 6 gears? or are they easier to pedal because of their lightweight? I notice all the comfort ladies bikes are only 6 gears. could someone add some insight on these bikes?
 
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