Just saw this video where he discusses and rates how good clove will be on all maps, the main problem with it is, he is assuming that clove smoke range after dying is the same as before dying. This changes the entire list. He says clove can lurk (implying that clove could potentially replace a sentinel like on ascent with double controller comp) and even if she dies she can still smoke but he uses the range of smoke she has before she dies.
Omens paranoia is way too good and will be one major reason why omen will always be picked over clove. And TMV made a good point ,why would you want to die and play post plant with your smokes after death ability when you can just live and add extra firepower, this is where omen tp plays a big role he can just tp to a safer location and wait for his teammates. Also forcing double controller on maps just to play clove limits certain plays, like is it worth to replace jett with clove in icebox. Plus omen paranoia is used for both site retakes and execs so having him will always be useful over you having a dead agent who can only smoke in a limited region and has an ability which is a cheap version of fades seize.