Seriously just get one already, there are plenty in the for-sale section. ?
I actually thought the T-16 sounded more synth-like, and by that I mean buzzy. That’s because you can open its filter right up. Even with the filter open it is very fat. It also gets way dubbier as closing the filter cuts off all the high end.
By comparison, the MXR has two fixed voices, each with its own volume knob. The “growl” knob on its own it quite OC-2-like but thin as doesn’t have the full bottom end. You need to blend in some of the “girth” to achieve that. You need to strike a balance as adding “girth” seems to mask some of the buzzy character.
Think the MXR really shines when you blend in clean signal and being able to use the mid boost makes a big difference (and I haven’t even tried flipping it to the other frequency or adjusting the gain).
You will be pushed to find an analogue octave pedal that plays as tightly and tracks as well as this.
What do you mean by “clean octave”? Are you describing the character of just the sub signal? Do you mean something like “devoid of buzzy high-end overtones”? Do you Class the T-16 with the tone rolled off quite far “clean octave”?