1939 said:

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We had the option of $750 an acre and 22.5% or $500 and 25%.

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Sounds like you already signed the lease. Am curious why you asked the question in the OP after as that would strongly affect the decision above.

We have mineral rights in several areas that get leased often. Our sections in the Permian have been divided among heirs, but as they are all adjacent, the leasing company always wants them all together. In our area, it has been a while since they have actually drilled but my cousins always want the higher royalty as they are greedy. I've been lucky to structure my lease (all individual even though wanting the grouping) to get the higher lease per acre with lower royalty. My dimwit cousins haven't figured it out yet that the leases in that area aren't for drilling but as preventative (I'm forgeting the O&G term people use on that)

Now other areas that are known to be drilling almost always, then go with the higher royalty.

I would advise against making any oil and gas investments based on a cold call. There is plenty of capital in the space for good or decent deals. If someone is purposely raising money from oil and gas outsiders, they probably weren't able to raise it from insiders.