D'Arce v arm triangle from side control

If you had someone under your side control and have sufficient control to choose either to try to D'Arce or arm triangle them, which would you choose, and why? Is one typically more efficiently finished? Are there positional vulnerabilities present in one and not the other? In theory I would think that the D'Arce is tighter but slightly more complex to set up and leaves you without a post (other than your head) on the far side, whereas you can let an arm triangle go and you have a post right there, but I want your thoughts...