Personally I'd go ldr, it's my fav sniper in destiny but I warn you, the chance of you getting what you want is super low. First you have to get an Engram ( I know that sound stupid but it is a stage) then it has to be special. Then either initially a legendary Engram or you get super lucky and get a blue to go purple. Then it has to be a sniper and then you have a 1/5 to be the sniper you want. Then you actually have to get perks worth using sooooo..... It's a long shit to say the least especially as all current legendaries will become redundant