My experience with A frames is I lived in a few of them in my 20s.
The “vertical wall” thing can be an issue. One had windows on the ends only. I just built that slope into two long closets & had one large living area.
I have lived in another that had a loft over half of the 1st floor. That bedroom & bath were the warmest ones in both the summer & the winter. It can be nice, but in a warm clime in the summertime, it can be brutal. It did have an elevator, though we rarely used it.
2,000 square feet is a fair amount of space. I have worked in airplane hangers that were smaller than that. That is 50 ft X 40 ft!
I raised two kids in a house that was 980 square feet. OTOH, we have five acres, a barn & several out buildings. We live outdoors a lot.
Many of the houses I grew up in were less than 2000 square feet. I have seven sisters & one brother. That is 11 folks living in less room. Yes, I played outside a lot.
It is your land & your money, so do as you please. Just curious, how many square feet is your current home?
Log cabin kits work well & most floor plans are well thought out. I may be a bit biased as my cousins used to build these kits. I have helped erect them & lived in one for a summer. I really liked it.
They retired from that about ten years ago. They now live in one of their kits on the acreage that their dad deeded them 30+ years ago. They still help out at the “factory” when so inclined.
I saw/see few downsides to them. Yes, they need maintenance & it is different than what a stick built home needs. Yet, I do not believe it is more then that. They look cool. Plus, if the eave overhang is large enough, the amount of the maintenance is reduced. Just like steeper roofs need less attention, homes with longer eaves also need less attention.
My experience with modular homes is less then stellar. I live in one now & I would not recommend them to anyone. They are not as well built as a stick built home, nor a log home. Some of the higher end ones are better than ours is. However, I would spend the money to have a site built home before I would buy another modular home. If you want a maintenance hog, buy one of these.
You asked for our input, this is mine.