I have both the Walkabout 12 combo and a PH 1x12. There is a significant difference in the sound quality each cab produces.
The WA 12 is very punchy if needed, and also puts out a ton of low-end. So much so that it can get out of hand if you have a heavy touch on the EQ controls. I actually find myself cutting some below 40-50hz on this cab. It has a very nice full range tone that is very "creamy" and smooth in the low-lows, and easy to tame in the low-mids and midrange. It fits my jazz oriented work very well.
The PH 1x12, is very crisp compared to the WA 12. Puts out plenty of low end (for a 1x12), and will handle plenty of power, but is clearly (at least to my ears) a much more low-mid/mid punchy sort of cab than the WA 12. I find the PH 1x12 much more "aggressive" sounding than the WA 12 and, for my tone goals anyway, I have to roll the mids/upper-mids off some to get it where I want it.
Both cabs have great controls for the upper range, which I personally tend to roll off a bit. Very musical highs that come to heel with little effort.
I happen to prefer the WA 12, but that's just me.
as always, my comments are IMO/IME .. your mileage may vary.