Go for welded deck vs stamped deck. They all use the same engines from Kholer or Kawasaki. The ones I physically sat in (toro and cub cadet) both seemed equally solid. I imagine you'll be able to find a post/video for every model of mower that highlights an issue someone had.
For me, since I'm only doing one lawn per week, I imagine unless I abuse any mower it should last my lifetime. Hell when I a teenager we had the same mower at my mothers house for like 15 years and that thing was ABUSED. I'm talking no fucks given ridden hard put away wet maybe taken for a "tune up" every few years. I'm pretty sure my father got that thing used, and it still functioned when the house was sold.
You might value things differently but I stopped trying to min max what mower will give me those extra 300 hours 25 years from now and decided to go for comfort. I've never enjoyed mowing but since getting what I found the be comfortable and easy to drive (along with bluetooth hearing protection), I can solidly say that it's actually not too bad anymore.
for reference I have 3 acres to mow, I went with the ZTS2 60". It's the steering wheel version, extra comfy for lazy driving.
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