How can people assess unconditional removal for one more mana as strictly worse than 5-mana removal that probably can't kill their 5-drop? I get that blocking is the way to kill things in this set, but even with the whip it's easy to read and still requires setting up.
Sip all the way.
No one said anything about strictly worse.
That said, the difference between 5 mana and 6 mana is often 2 turns, if not 3 (it's pretty rare that you hit every land drop on your first 6 turns). So true, whip may not be able to kill their 5 drop without help, but by the time sip can kill that same 5 drop, that 5 drop might have killed you.
Instant speed is also pretty damn relevant in a format full of combat tricks and auras.
Your first statement ("I'd pick two," etc.) reads like you'd pass hemlocks until you got a 2nd whip. I'd say that's a fairly aggressive preference.
Yes, I prefer whip, no questions. I didn't say whip is strictly better though. If I thought whip was strictly better, I'd always pick whip over sip. That's not the case. I pick sip over whip if I already have two whips. So I do see sip having its advantages.
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This is an 18-land limited environment. I don't think a land is a two-turn difference in a black deck running sip.
Even with 18 lands, I highly doubt you'll regularly get your 6th land turn 6, although I don't have the supporting probabilities right now. I'll try to look them up.
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Also, you're generally tapping out in this format, so keeping mana open to cast a meh combat trick is already a losing strategy.
EDIT: Well, OK, you're not always tapping out in this format, fine. But the grindier decks--ones that want sip--don't mind the tempo loss from sorcery speed unconditional removal.
Here's the thing. If you're going to use your removal spell anyway, in most cases, you lose nothing by waiting at your opponent's eot (yes, I know there are situations where you should play your instant speed removal on your own turn). So I don't know why you'd think keeping 5 mana open to play your removal during your opponent's turn (or during your own combat) is any worse than casting your removal on your own turn. The advantage is that by waiting on your opponent's turn, you may be able to kill a bigger creature than usual (if he attacks into your blockers) or getting a 2 for 1 on a combat trick or a non-bestow aura (even if you kill something in response to a bestow aura, you still have a significant advantage, considering they just paid, on average, 3 more mana for their creature).
That's not even considering the times when you have multiple options at instant speed (other combat tricks, monstrosity, etc.)
Overall though, it's about mana curve. I don't want my deck to be full of 6 mana removal. I don't want to wait till turn 7 or 8 before interacting with their creatures. I do want sip in my black decks, but I'd rather have 3 whips and 1 sip than 3 sips and 1 whip. My choice may differ if it's 3rd pack and I haven't gotten any removal yet, but at that point, it'll be very context dependent.