I dunno man. I got lucky week 1 and got patience and time from a legendary engram.... It has since been fully upgraded and used quite regularly. I feel like the icebreaker even without full upgrades is being more useful overall. First being that I can basically use it as a primary weapon due to infinite ammo... while I was helping a friend do the nightfall last night I didnt use anything except the ice breaker the entire time and with the solar burn stuff activated I was just melting through things... on top of never having to worry about running out of ammo.. Also the scope on icebreaker at least to me is way more managable. Patience and time zooms WAAAAY in and it makes it hard to use the thing except on anything extreme range, I was able to use Icbreaker pretty easily on mid to close range targets. IMO patience and time LOOKS alot cooler and the cloaking on it is pretty awesome but TBH it really hasnt been a huge game changer... regenerating ammo and chance on ammo being restored if I miss a shot on the other hand has been a game changer. I have both and will continue to use both BUT i have a feeling once i get icebreaker fully upgraded my patience and time will end up in the bank more often then not.