A consistently higher amount of money sounds better than a lower-paid job you don't enjoy.
If you still want to wait for a reply, then just send an application to the Blueberry job.
You have full right to turn down a job after it's been offered to you.
If the other guy doesn't reply, then go for the blueberry one.
If he does, then come up with a decision and go for whichever you prefer.
And if you go for his, then just politely tell the blueberry people that you're working with someone else now.