How strong is this Tail Slap under these setups?

Question

I am trying to make a sweeping Cinccino to mess with some friends. The idea was:
Cinccino @ Silk Scarf
Technician Ability
-Tail Slap

So, I thought that was good, but then I remembered that the item Choice Band exists. My question; would Cinccino, Technician, STAB, Silk Scarf be stronger or would Cinccino, Technician, STAB, Choice Band be stronger, along with about how much is the Base Power of a single Tail Slap (including STAB) for each?

Comments

What is the set? The EVs would help.

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252 Atk 252 Spd and perfect ivs

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ok thanks

Answer 1

252 Atk Choice Band Technician Cinccino Tail Slap (5 hits) vs. 248 HP / 0 Def Abomasnow: 465-555 (121.4 - 144.9%) -- guaranteed OHKO vs
252 Atk Silk Scarf Technician Cinccino Tail Slap (5 hits) vs. 248 HP / 0 Def Abomasnow: 380-450 (99.2 - 117.4%) -- approx. 93.8% chance to OHKO.
The EVs are 252 Atk, 252 Spe, and 4 SpD. The Nature is Jolly. Choice Band makes Tail Slap stronger than Silk Scarf. Adamant would not change that Choice Band helps Tail Slap do more damage then Silk Scarf.
252+ Atk Choice Band Technician Cinccino Tail Slap (5 hits) vs. 248 HP / 0 Def Abomasnow: 510-605 (133.1 - 157.9%) -- guaranteed OHKO is better than
252+ Atk Silk Scarf Technician Cinccino Tail Slap (5 hits) vs. 248 HP / 0 Def Abomasnow: 420-495 (109.6 - 129.2%) -- guaranteed OHKO.
Those calcs are with Adamant.
Source: https://calc.pokemonshowdown.com/

Answer 2

This answer ignores rounding because rounding in Pokemon is ridiculously complex and usually has no effect or an insignificant effect.
Tail slap's base power is 25.
source
Technician is a 1.5 power multiplier.
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Silk scarf is a 1.2 power multiplier.
source
Choice band is a 1.5 physical attack multiplier.
source
STAB is a 1.5 damage multiplier.
source
Tail slap's power with technician and silk scarf is technically 45, and its power with technician and choice band is technically 37.5. But if you pretend that choice band and STAB are power multipliers, then it's 67.5 with silk scarf and 84.375 with choice band.

Comments

So with Choice Band the move is effectively 168 since it attacks at least twice?

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It's at least 168, median 253, and at most 422. If you use skill link instead of technician, then it always hits 5 times, so its base power is always effectively 281.