Any of those 3 would be a great choice. I can't comment on a Wizard since I've never had the pleasure of playing one myself.
I do own both the Alta & Hellion. Both will do what you want and have great mater volumes, so it'll come down to features, specific tone, and your specific needs.
Alta:
A 3 channel amp with the quintessential Marshall tone. Each channel has a little overlap in saturation, but picks up mostly where the previous one left off. Channel 2 & 3 have a shared EQ. At least to my ear they have a slightly different voicing. Ch2 sounds a little more vintagey and Ch3 slightly more modern. It can do both modern and vintage voicings on both gain channels and both modes have a slightly different feel. As it should be vintage is a little looser feel while modern is tightened up some. You also have bright switches, clipping diodes, and everything accessible through MIDI. To me the Alta is the ultimate multi channel Marshall style amp.
Hellion:
It's Marshall DNA, but has a little more emphasis on the low-mids. Not that you don't get upper-mid grind, just a little more pronounced lower-mid than what you think of from a Marshall style amp. It's a single channel amp which does limit it if you really need channel switching. What it lacks there it more than makes up for in being able to fine tune the tone & feel. The 4 front switches and 1 rear switch give you great control over the voicing and feel of the amp. Then there's the Aura, Gain Style and Clipping knobs that allow for further fine tuning of tone, feel and saturation. If you don't need to switch channels on the fly, want a hint more lower-mids, and have ultimate control of shaping tone & feel, then the Hellion is the one for you.
I'm going to put another option out there for you. One that's been on my radar for at least a year and I finally bought one about 2 weeks ago...
Full disclosure, the builder is local to me so I'm a little biased in that regard.
https://www.sonictoneamps.com/
SonicTone Loyalist:
His website isn't updated with the Mk2 yet, so if you look them up keep that in mind. The Loyalist Mk2 sits fully in the British voiced category. To my ears it doesn't copy any specific amp voicing, but captures the British tone. It's a full 4 channel amp; Clean, Crunch, and 2 High Gain. Clean channel wasn't just an afterthought, it was designed to do full clean to light crunch. Crunch is basically a JCM800 style preamp. There's a hotrod switch which is like hitting the front end with a transparent boost. Ch3 is full on British high gain. Also a mid scoop switch which is self explanatory. Normally Ch4 is a duplicate of Ch3. I asked for the Patriot model's high gain channel instead (this will be offered as a standard option now). So my Ch4 is more American voiced with a bit of British bite. There's not as much control over the feel, but it's also one of those less is more things. The feel sits in a nice spot. Tight, but not too tight; loose but not too loose. Worst case you tighten it up a little more with a boost. I've discovered you can change the tone and feel a little with the channel and master volumes. CV low/MV up is brighter, tighter and more Marshall in tone. CV up/MV low is thicker, a little looser, and reminiscent of the Laney tone. The Loyalist is every bit on par with the Alta and Hellion and is becoming one of my top amps.
If you want the same thing, but more American voiced check out the Patriot.
