I think you need to play them.
I never played a sub stingray, so I can't say much about that, but I owned a Squier active 5 for a while, and played lots of gigs with it. I believe that was the most bang I ever got for my buck out of a bass. It sounded amazing, and it felt amazing... but, and this is a big BUT, I highly recommend you try before buying. It's big, it's heavy, and it has wide string spacing. I liked the spacing, but I lent the bass out a couple of times and not everyone agreed.
I'm certain the MM sub is top notch too, but I'd rather have the real thing regarding that. And I do.