For what it's worth . The ratcheting type crimper tend to be more consistent in the crimp especially one that is adjustable to limit the crush . Over crushing the crimp and severing the wire strands is bad only second to a under crushed crimp .
I make all of my own extensions but I use a Packard /SPX crimp tool , 300.00 + when new . No I didn't buy it to make my own extensions I once was an automotive electronics specialist and master mechanic for a little over 30 years .
Don't waste your money on 20.00 tools unless you don't like your airplane . You can find some great deals on quality crimpers online just look around .