Here's how I feel about it: Use what works! If something worked for you this time, great. It's just that instance is a one time thing under questionable circumstances because you were doing water changes and had some seeded media, etc. Try a couple more tanks from scratch and report back. I'm always interested in something new.
It wouldn't surprise me at all if another product worked as well as stability. It's just that Stability has proven itself many times over to myself and other MFKers, so it's popular on here. That definitely doesn't mean there aren't other products out there that work just as well! Just do the tests and prove it, so we can all learn something.
There ARE other factors that can affect your cycling time, namely ph and kh, even with stability. It might just take longer. There's all kinds of things going on at a chemical level I'm sure no one on here fully understands or could even begin to know without some heavy duty lab equipment. It's a lot more chemically complicated than ammonia->nitrite->nitrate when you get down to it.