While you can choose ZTR, Push, Reel and Self Propelled mowers nothing can beat the importance of Riding Lawn Mowers for 3 acres.
Superficially it looks like a simple choice however on a deeper look you will realize that it is quite a cumbersome task. It will cost you your back muscles and energy if you make a different choice. The best decision would be to look at a solution that decreases the workload coupled with essential features that save time!
After pondering over this problem and hours of research I have come up with a solution that meets the demand of a 3 acre lawn. The riding mowers assembled in the list below are not only powerful but mixed with accessories that decrease maintenance and updating. You will only have to do occasional work to bring out the best of your lawns.