Originally Posted by AngeloDolce

I wouldn't hesitate to buy a ladies bike if the size fits you better. A few people may (or may not) give you a hard time but a bike that's too big is not good.

For gearing, the rear sprocket on the single speed may be a little small (higher gear), but it sounds like you may prefer this, especially if you don't have many hills or long rides.

US measure is gear inches = 46teeth front / 16 teeth back x wheel size 27" (close to 700C) = 77.6 inches
What gears are you using on the folding bicycle? What is the wheel size?

The singe speed/3 speeds I normally ride typically have a gear that's a little lower, 26 inch wheels with 17-18 tooth sprockets, for gears of 66-70 inches, but I often ride longer distances and may have hills.