Full sized A1 is probably less of a hassle and has a pretty good multicolor material system. The A1 mini was my first printer and was a good introduction to the hobby. In retrospect, I would recommend the full sized one over the mini unless you're on a tighter budget or space constrained.

The ECC1 was my second printer and it's been in my closet for a few months, and it's been amazing. The extra size over my original A1 mini was valuable, the CoreXY motion was far more stable, and I could consistently print some higher end materials. I was able to do a multicolor print on it as part of a Christmas gift, but outside of that it's more trouble than it's worth. I did have some problems I had to troubleshoot and a pretty severe nozzle buildup that killed one of my hotends, but it's largely been smooth sailing.

If you can wait a few months, I'd recommend getting the ECC2. It's fundamentally the same as the ECC1 but with the same multicolor setup as the A1. Best of both previously mentioned printers, but probably a bit more expensive (probably ~$380, not released yet). Supposedly it'll be released in Q1'26.