Hello!
In the end, it doesn't matter which employer (or combination of employers) you choose, just make sure you change the W4 on at least one of them to reflect all of your income.
You can use https://turbotax.intuit.com/tax-tools/calculators/w4/ to estimate your refund with your current pay stubs. Then, you can adjust the slider with an additional amount to be withheld per pay period to calculate a new estimated refund/amount owed. Adjust it until it shows what you want for your end of the year result. Then fill out a new W-4 for one employer (or combination*) with Line 4c reflecting the additional amount you want withheld per pay period. Make sure you sign and date it and submit your new W4 to employer.
*For example if you find you need to withhold $100 more per pay period and both employers pay you twice monthly, you could fill out a W-4 form for both employers with $50 on each of them. (The end result will still be $100 more withheld per pay period.)
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