[I was looking at some cartridge brochures and found little or no choices in 444 Marlin.]
As the old hot rod saw goes: "There's no substitute for cubic inches".
When the .45-70 started re-blooming, driven at first by Marlin, then Ruger (#1 & #3) & Winchester/Miroku & H&R, then re-inforced by bullet and cartridge makers like Nosler & Garrett - the .444 started (and continues) to come in a poor second.
I bought my first .444 in 1967, and was disappointed because Remington (the dummies) loaded pistol slugs into the long cases at the .444's higher velocities, causing bullet failure on close range shots.
I lost and/or destroyed three deer, before I finally started loading some Hornady 265gr.
The 70's .45-70 factory ammo was nothing to write home about, either - being so underpowered (for fear of Trapdoor's, etc) that shots much over 75 yards had to be lobbed.
When I first abandoned the .444 for a .45-70, I used to miss running deer that were at a distance (say 100 yds) because of the lead, etc issues - that are now minimal with the advent of modern 300gr express loads.
The point is, in those days, if you didn't handload, you were at a loss.
These days, we take for granted as factory loads, what was once unobtainium.
Ergo, many bibbore fans (like me) switched to the .45-70, and with only a few subsequent stabs at trying another .444, and stayed with it in the end.
I've found the .45-70 to be better in several regards:
It handles a 5x wider & 2x heavier range of bullets,
It's available in a 4x wider selection of makes/models, with some at 1/2 the investment,
It's 5x more resale-able than any .444
.