My reason s for the 45-70
If it helps, I would strongly reccomend the 45-70 over the other two mentioned rounds, especialy if you are going with a lever gun.
I will give you my humble opinions.
First, for what you say you want the gun for, Northeastern Hunting at your specified ranges, the 45-70 has several factory loads that will fit your needs as good or better than any of the others. My favorite, and I am sure many others being the good old Remington 405gr. Jacketed Soft point load, or .405JSP, at around 1300fps, give or take, it is an excellent load for anything in your area out to your 150 yards- as you specify, and a bit more depending on your skill and how you have the gun sighted. That load by itself will more than satisfy your requirements. Whether it is called a "Brush Gun" or not has nothing to do with what you are talking about in my opinion. The Marlin Guide Gun in 45-70 is all you ever need to fit your requirements and much more, for that matter. You also have many, many factory load options, as in the "Leverlution" that would give you a signifigent increase in "Point Blank Range"- that is the distance that you can hold your sights " Dead On", or "To Point of Aim" without having to use holdover to compensate for bullet drop.
There are also much more powerful loads, from Cor-Bon for example that will turn your gun into a "Dino-Dropper" if you should feel the need. As far as cost of ammo, I think that you will be able to buy suitable 45-70 ammo for as inexpensive as anything else, and in my opinion you will find it much less expensive than the others.
As far as the price of the rifle itself, does the saving of say $50.00 Dollars or so matter when you are purchasing something that will last many decades? I am in a great financial bind myself right now, being as I am disabled at the age of 53, but try to envision yourself in say, twenty- five years saying, boy ain't it great that I saved a few bucks on that gun a couple of decades ago, look what we have done with that money in the last twenty-five years!
As another poster rightly mentioned before, the .444 uses .429 bullets and there is just not the same variety out there as is for the 45-70. And Brass and factory ammo for the .450 is not nearly as readily availible for for it either. In my humble opinion the 45-70 will still be hugely popular when the aforementioned rounds are fodder for the articles about "Obsolete Rounds" in the Gun Mags. And yes I have a grat personal respect for the round, I hope it did not show through in any way
. But those are the facts as I see them.
Best of luck with your new gun, whatever it may be!
As always, JMHO, and YMMV.
God Bless,
Willy Henderson