As stated above, the key questions are restrictions/codes and how its used. Provided thwy are not restricted, comes down to cold vs heated storage and what you want for walls. If its for cold storage and only temp heat, go pole barn. Regardless of your heating options, use an insulation blanket for the roof. Helps with sweating and dripping.
Regrets come from going cheap. Most common for insulating a pile barn is spray foam. Beat insulation, but comes at a cost. Truss design, perlin layout,. All dictate if you have a glorified piece of crap or a very well built structure. Beware of low ball pricing. On that size barn, if you see 2-3K difference in price, someone is cutting out quality. Been in this business for a long time. Amazing the flipping hacks I run into.
Btw, 25 years u built this house. Razing it this week. I can tell you a very well built structure is a major PITA to tear down
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