I have seen both in person, I have not had the opportunity to cut One
In the end, it is your decision. I had a beast of a Gilson garden tractor back in the early 90s that I beat the heck out of. Then I bought a small White LT16. It was nowhere near as capable as the Gilson was, but it had a Vanguard motor that purred and lasted for a very long time (about 2000 hours and still perfectly fine when I sold it) but the tranny, the deck, the axle spindles...basically everything other than the Vanguard v-twin, were worn out from simply mowing lawn.
I moved into a 2 year old Simplicity Conquest with less than 50 hours on it and that was a much nicer and more capable machine. I found that the more I liked the tractor, the more I wanted to do with it, so I traded the Conquest for a Prestige EFI.
If you truly only want a light duty rider, than by all means, either of your two listed choices will be at least OK. However, if you have any thoughts of plowing or blowing snow, towing a heavy cart, pulling a cyclone rake, etc, you may want to consider a medium duty garden tractor. If cost is an issue, you can find really nice 5 year old garden tractors in roughly your price range.