On a stablecoin move both ends are worth about a dollar, so the only thing separating one route from another is what it quietly takes on the way. That is the easiest cost to miss and the cheapest one to avoid. We quote them together so the gap is visible before you send, not after.
So the whole difference between routes is fees and slippage. There is no price move to blame it on, which makes the comparison unusually clean.
The route that wins on 500 dollars is often not the one that wins on 50,000. Re-quote at the size you are actually sending.
If a route cannot fill, that address is the only way the money comes back. We will not mint a deposit address without one.