This is your first “bigger” gig? Take what you get and make it a success. You should have an idea how the two stack up, so you could delay responding to the first offer, if the second job gives you offer. I wouldn’t recommend accepting a position, then calling back saying, “no thanks, the operator down the street offers more”.
The importance here isn’t a few more dollars, it’s building success and a reputation; your gaining confidence in yourself and the confidence of employers.
GF