The biggest issue with crimping is not to over crimp it. It takes experience and time (time to see what fails and what doesn't). I use LOBSTER AK 17 with the ratchet removed, so I have full control of the crimp. They are rated for non insulated, but I use them on everything because I have not yet found a crimper which is rated for insulated terminals which does a satisfactory job.

I recently got an assortment of wire fly non crimp connectors with the eutectic solder but haven't had much chance to use them. Of course, I tested a couple as soon as I got them, and with the mini crack torch they seem to work well.