Neither here nor there, I just follow the $$$. I had the same issue but a new axle cost $207 and spacers were over $100 so I had a new axle built to the exact spec I needed.I know some people don't like spacers. We're not gonna get into that lol.
I really like your tire/wheel choice. Tall and skinny mud tires capture that vintage trailer vibe. I built around matching my truck for sake of simplification (and hand-me-down tires on the trailer) but much prefer the look of what you have there.
Nice work.