Phoenix Wing has its use in PvE that imo, makes it better than Blade Call. It changes Dragontongue range to 3m center to the caster (same concept as tab/Violent Blade), and you can use your PW anytime where as you can only use Blade Call when there is a target. Plus, you have to w8 5 secs till the BC dmg burst comes, which is why I prefer FoBs over BC in pvp since u can just CCed then tech chase your opponent afterwards for good dmg.
The reason I believe we have two variations of Lightning Draw/Searing Slash is mostly b/c of type preference. Lightning build (Hone Slash) is mostly f