Crimping (properly at least) is superior to soldering. As odd as it sounds it's quite true. When you solder stranded wire solder wicks up the strands & fuses them solid. You then end up with flexibility issues. Chances of damaging insulation is high as well. In the event of any issues, wiring heats up. That doesnt phase crimps much, but soldered connections can fail catastrophically in those situations.
All car & aircraft wiring harnesses are crimped. If you have the right crimper an idiot can get a good crimp that can easily be inspected. Soldering takes skill & in blind lugs like you are talking about they cant be inspected.
There are dozens of cheap hydraulic crimpers out there. Goplus 16 Ton Hydraulic Wire Crimper Battery Cable Lug Terminal Crimping Tool w/ 11 Dies
https://www.amazon.com/dp/B00ZA2P3XM/ref=cm_sw_r_cp_apa_i_h2iWCbYH1SJN6 is a random one off Amazon. I'm sure its identical to the others there or the one from Harbor Freight. I picked up on off Amazon for a pile of big Anderson connectors. Its a cheap tool & a little fiddly to use, but great bang for the buck.
I'm sure you could make soldering work, lots of people have, but it's an inferior technique for most modern applications.
Also, get the right sized lug for your wire & terminal. You can use a copper pipe as a shim or fold over the wire, but that severely weakens the connection.