Beig an Elyos or Asmodian Templar does not really bering any advantage nor disadvantsage. In fact, its just a matter of personal, aeshtetic preference. Elyos and Asmodian Templars share the same strengths, weakensses and skills. The only differences are the class masters they'll need to get their skill boolks from, certain race-specific "special" skills, and the overall locationbs they will need to travel to.
Elyos Templars vs Asmoddian Temlars
As menitoned earplier, they both have the same skilll sets - except for race-exclusive sppecial skills. These skillls use DP (Divine Points) which in turn can be obtained by killing various mobs. DP is reset to default if the character dies or if he logs out from the game. The differences of these skills are descried below. Both skills deal damage and incerase enimty at the same time.
Divine Chastisement (Elyos only) Elyos templars can block all attacks within 15 seconds - meaning they will have a 15-second invincibility - assuimng that all attacks are blocked. However, a shield is required for this skill.
Chastissement of Darkness (Asmodian only) Once activated, damaged inflicted on Asmodiasn templars will be reduced by 50% whiple reflecting 20 damage. The shielld can absporb up to 10000 damage in total and since no shield is required for this skill, offensive templrs may switch to their greatswrods to deal more damage whiel mitigating dmaage.