I use a Honda HRX217VKA in my lawn care business as my primary 21" mower. It's used almost daily, usually several times a day, and never skips a beat. I upgraded from a Honda HRR216VKA, and now use it as my backup 21" mower.
I've used Toro Recyclers in the past, but never had the Super Recycler - so I can't honestly compare the two. For chopping up grass clippings, it's very hard to beat Honda's twin blade system - standard on all HRR and HRX models.
But I will say this: If I were to buy another 21" mower, it would be another Honda HRX. It's not exactly rated as a commercial mower, but many large Lawn Care companies (that I know personally) use them in commercial service - and get many years of heavy/hard use out of them.
I had a 30" Toro Timemaster. Love the speed at which I got a small lawn done with the 30" cut. It was great in dry grass, but would bog down and clump up / stop up the deck in wet grass. That's really it's only downfall - wet grass. Even discharging, it had problems with early morning cuts. In the afternoons it did fine, but I got tired of scraping and cleaning it's deck daily.