Idk, I run Sleeper (with the Catalyst) in Prime and find it way more reliable over 1k. Sleeper has a faster charge time, instant kill after the charge that cuts back on trades massively, ADS quicker, holds WAY more ammo, and it can hit crits on the Primevil meaning it out damages 1k if you land crits. Also Sleeper is fantastic at shutting down people flying thru the air like a blade barrage hunter with 1 shot where as 1k will damage them with the initial beam then the explosions will happen way up in the air where the enemy used to be leaving the enemy still alive leading to your likely demise as you wait a year for 1k to charge again or switch to another weapon lol. Also 1 Sleeper shot will over penetrate multiple targets allowing you to get 1k like ad clear if you play into it, go into engagements looking for a good angle that has enemies lined up and body shot them all. Also the chances of killing yourself just because a teammate or ad moved infront of you while shooting 1k, even if only for half a second, are astronomically higher when compared to Sleeper lol. Imo Sleeper wins over 1k any day unless maybe you are rocking full +15 reaper gear and using 1k for ad clear from a position that allows you to kill everything on the screen, tho that's easier on PC with a mouse compared to console so idk. That's the only situation I can think of.