User blog comment:Aruvin19/Who should I raise first?/@comment-26926066-20150927180457

Depends on what u want. Tazer has a powerful infinite  SBB that can be used to take down bosses, his LS also gives ur squad a decent 15% boost to HC and BC drop rate along with the 75% spark damage added. Colt can give ur whole team a 150% boost in crit damage with improved crit rates by 60% as well.

Tazer also has a higher damage multiplier on his SBB than Colt. His SBB has the same hitcount as Colt's but instead of a 60% increase in crit rates and gradual BB gauge recovery of 5 BC per turn, it gives the squad a 75% boost to spark damage.

Colt's UBB gives a lot more blunt attack damage (200%) and a 70% boost to crit rates which is great against soft targets with weaker defense. Tazer's UBB instead gives a 2 turn def-ignoring effect to attack and a 120% boost to spark damage instead. This is better against high defense targets but the def-ignore only lasts for 2 turns rather than the 3 turn spark boost and the 3 turns boosts from Colt.

Tazer's ES also doesn't require a sphere or other unit to be activated and is useful for his attacks rather than Colt requiring either the Ice Blade sphere or Claire to be in the same squad. But the problem with Tazer is that his abilities are more selfish than Colt. Colt's abilities can aid the whole team and is better during instances where BC is harder to get because of his SBB.

One  MASSIVE  factor should be ur ability to hit sparks. If your team comp is easy to hit sparks with, go with Tazer. But if u find difficulty with that, choose Colt for damage.

So overall choose depending on ur needs. If u have to do lots of boss fighting/have to focus a single unit then evolve Tazer. If the focusing of one target isn't really a problem and u can't really hit sparks, choose Colt.

Good luck and i hope u can make ur choice about this. Later on, sooner or later, you will be able to evolve both. <3 :) Happy days.