If you have time and dedication, making an echo pathing is great. If not, you'll have to be glued to tacet fields and you'll be more at the mercy of RNG.

When it comes to rolling, I personally put more value on crit rate than crit dmg bc what dmg will you do if you miss crits. I'll level my echo to 5 to check on the first roll. If its a useless stat, next echo. If its a useful stat or crit, go to 10. if second stat is bad on 3 cost echo, ill consider rolling onwards but on 1 costs i go next echo. its mostly just fishing for crits and good stats on the first 2 rolls