Which to exeggcute to evolve?

Spending almost half your dust is hard to justify. 57iv is kinda low but in the end it won't matter too much in battle, just how high your cp will be. The IV calculator will show what you would be missing out on cp wise.

If I were you I would wait for a different one with less dust and hopefully higher IV, because it is an important attacker/defender. A perfect exeggutor is tempting though..

Forty-nine candies as a training cost feels like less and less as you level up. Some people might be satisfied with a 57% IV exeggcutor, but personally, I wouldn't. I would probably evolve the 100% one. It's hard to resist at 100%. What are their current CP values?

I would evolve the 100%, just because I know the IV's of 57% would end up bothering me, while they don't make that much difference. If it gets bad moveset, then I would evolve the another.

I can't bring myself to spend that amount of dust on any pokemon. That is why almost all of my recent egg hatches are still unevolved. It is tempting to have a 100% exeggutor though. Good thing with them is that there are really no bad movesets. If you do not mind spending the dust, I would choose the 100% one.

I might wait until you got something like an 80% exeggcute that would take ~30K or less stardust to evolve. On the one hand, 57% IV is a bit low, OTOH, 60K stardust is pretty high.

Although... if candies aren't an issue, go ahead and evolve the 100% IV one anyway. If the moveset sucks, don't power it up. If the moveset is what you want, then maybe consider making the stardust investment.

If candies are not an issue here go with the 100.. and hope it gets the best move set attack or defence wise.. good luck bro!! If its an issue wait for a better cp and iv pokemon!!