I started a thread a couple of years ago asking about lever guns and the 444 did come up for discussion. On the face of it, it would be the better choice if only because it seems more able to reach the Scottish legal velocity requirement (although I don't go to Scotland much, that could change...)
Unfortunately they seem less common over here than 45-70s, which also aren't especially common compared to most "normal" chamberings. Add the scarcity of factory ammo and the lack of many reloading options and it's probably a bit of a non-starter.
I've got an 1894 Cowboy Limited in 357 (which is my wife's gun really) and I have a new 1894 SBL on order in 44 Rem. Mag... So at least I'm not totally devoid of levers while I svae my pennies up for a big one