This has been discussed many, many times here on TBN, you can do a search and read for a long long time. With that said, if your major purpose of your tractor is to mow lawns, then do not load your tires. Any other use, I would load the tires for sure. You just can not imagine the difference in how the tractor handles and how much more capable that it is with the tires loaded.

As far as wheel weights, they have an advantage, as that they can be relatively easy to remove. But the negatives outweigh that positive in my opinion.
If you really need the ballast, typically wheel weights just don't weigh enough,

and they usually cost more than what it would cost to fill-load your tires.
I went the wheel weight option to start with, in fact I installed 4 sets to start with. I noticed a difference, but not enough for what they would normally cost.

I then filled all four tires, oh my goodness, what a difference, it was like driving a different tractor.
I'm sure others will have different opinions.
