IV's vs. Optimal Moveset

Man, this is a very specific scenario: the 100% IV Dragonite will have more max CP than the 49% IV one, that's for sure.

But...

Imagine that the 100% IV one is just 10% better (in stats) than a methaforical 0% IV Dragonite (according to the researches, IV is largely known to not be as impactful in PoGo than in the other Pokemon official games)

So, the A ranked Dragonite gets 20 + 34.38 true DPS max (this is based on a 0% - base stats - dragonite, I think) and the C ranked gets 14.29 + 34.38. I might just doing conjectures here since this needs real calculations, but I think the 49% one still gets the advantage.

Plus, you can always rely on non/super-effectiviness when doing battles. From my personal experience, 50-70% IV pokemon with perfect movesets can absolutely destroy pokemon even almost double their CP if you use moves effectiviness in your advantage. I have a 50-70% Cloyster, Victreebell, Arcanine and Exeggutor that can kill Dragonite, Vaporeons (and waters in general) and Exeggutor like a walk in the park.

Again, by personal experience ONLY, I have a HUGE bad time trying to get the right movesets. So when I get a Pokemon with perfect offensive movesets, I dust the hell outta then and use then very often and efficiently

My aswer in short: Dragonite 2 performs better as an attacker, none of them is worth investing candies (as an attacker)

IV has no impact if your purpose is collecting, more if your goal is trading or battling and from lev 29+

Better IV makes your investments more efficient, both in candies and stardust

Same CP pokemons have similar battle performance no matter of their IVs

Moveset is more relevant than CP (up to 30%) and IV (up to 15%) for prioritizing evolutions

IMHO a rare pokèmon with perfect moveset is good enough to power up from 85%+ IV

Hope this clarifies, if you need more detailed explanations just ask ;)

Dragonite 1 has 3500 CP with moveset (Steel Wing / Dragon Claw)
Dragonite 2 has 3280 CP with moveset (Dragon Breath / Dragon Claw)

I assume your question is regarding offensive ability as you say Steel Wing / Dragon Claw is C-ranked moveset.

In offense, Dragonite 2 With better moveset but lower IV is 16% better than Dragonite 1.

However, if both had the optimal moveset (Dragon Breath / Dragon Claw), the 100% IV one would be about 10% better than one with ~50% IV one and ~22% better than Dragonite with 0% IV.

These calculations are based off Qmike's damage calculations.