This thread is all over the place as everyone is looking at one side either offence or defence and mainly just arena.
Basically what peeps are trying to say is
Kylo is good on offence and solid but defence isn't the best for arena but attack is decent. he's a GW veteran
FOTP is also great in offence but fragile, in defence he needs to be killed first . He's better suited to arena then GW and benefits sitting behind a fast tank.
So, focus on what you need - do you want to attack & gain places or defend your #1 spot in arena? are you struggling with GW?