There are two QB's I'd consider in the 1st, but to consider either top 10, I would have to see:
1. Mayfield measure with hands around 9 1/4".
2. Darnold has to finish strong and limit turnovers. He also has to declare, which sounds like a 50/50 proposition.
Jackson, Rosen, and Allen are not QB's I'd gamble on early, but someone will.
Mayfield is the best QB by a healthy margin, but small hands increase risk. 9" is the cutoff (Tannehill and Goff), but you'd really like to see 9 1/4" - closer to guys like Rodgers and Brady. As far as I'm aware, Tony Romo is the only QB in recent history to have success with hands smaller than 9".
After Mayfield and Darnold, I'd look up Jackson or Rudolph in the 3rd. They have contrasting strengths and limitations, but both can play under the right circumstances. You just have to live with Jackson's below-average accuracy and Rudolph's lack of improvisation. Jackson, of course, will be long gone, but that's where he's more likely to meet expectations.
On one hand, it's a great draft to go QB early, because the top-10 talent is weaker than most recent seasons (probably weakest since 2013); on the other, it could be a very bad year, because the QB talent might not be there (depending on the two points I highlighted early in the post). It's still early in the process, and we'll see how it shakes out.
If Miami waits until Day 3, Logan Woodside is kind of like a poor-man's Baker Mayfield. He's very good, and he aggressive pushing the ball deep, but he comes with questions about his physical tools. Arm looks good enough to me, but, again, we'll see.