If you want to know what the significant differences between a biplane and a monoplane would be, there really aren't too many.

Because the area needed to carry a payload is going to be almost the same no matter the number of wings, you often find that biplanes has shorter wingspans. Generally that's the case. Shorter wingspans can almost always give you a faster roll rate. The bipes tend to be less apt to stay level, and quicker to roll.

And since you're putting close to the same area into two wings instead of two, you get more drag with the biplane than you can and usually get with a monoplane. So the bipes usually wind up with a limited top speed that's obviously slower. And to fly along at slow speed takes more engine throttle with a bipe.

Beyond those, there are differences, but generally speaking those two are the ones that are most noticable. After all, you're going to get a biplane that's being made today, right, versus a monoplane that's being made today.