I am going to replace one of my push mowers this summer. I'm just starting the, I'd like verses the I'm willing to pay for, part of the search. This mower will be a self propelled. I see some have front wheel drive and some have rear wheel drive. I have used the front before never used the rear. What are the differences or advantages of the two. I will be using the mower for cutting the ditch next to the road. Long straight stretch. Also some trim work around trees.