Few people can offer a genuinely unbiased opinion about many things. The best a critical thinker can do with opinions is to consider the source and decide for yourself how much credence to give them.
In this case, my recommendation of the Stage 800 comes from my own 4 year experience with the Rumble 500 combo and my 10 year experience with Fender's very first bass modeling amp, the B-DEC 30. I've loved every minute of them both and truly believe that a combination of the two, like the Stage 800, is the ultimate best, so far.
That said, I admit to being a Fender fan for over 50 years. But I also admit there are other very good brands and products, and I own and enjoy some of them, too.
Unbiased? I know what I think. Question is, what do you think? That's what you should act on.
HTH