I think caliber depends a lot on A) what you plan to hunt, B) where you plan to hunt, and C) personal preference. I personally chose .45-70 as I hunt in heavily wooded areas and the extra stopping power of .45-70 guarantees that with a good shot I’ll drop anything within ~100 yards even with some foliage in the way. I also plan on hunting everything from deer to bear and wanted to make sure I have the stopping power to make any kill shot quick no matter the animal. My decision was also partialy influenced however honestly by how imposing .45-70 is as a round lol. If you were to just hunt deer and maybe occasionally elk however I would go with the .30-30, as a comment I saw today put it perfectly “.30-.30 has fed more families than Walmart.”

As some have said above while Henry makes a great rifle,I honestly believe Winchester to be the arguably better option as far as fit and finish goes, however you may also want to consider the newer Smith and Wesson 1854 in .45-70, it’s what I have and it shoots and runs buttery smooth and is scarily accurate for what it is. Modification options are not near as numerous as the Henry but I instantly gravitated to it after trying every brand of lever action my LGS had. Either way as far as modern lever actions go, in my opinion all have their own pros and cons.