15 or 30 year fixed that is the question?!

[John Novu]

A little background first, I’m in Southern CA, It’s my primary residence and not my forever home. I currently have a $2050 monthly Mortage which I usually pay $2200. I found a lender at 3.0% for 15 years which would bring it to $2375 monthly. (Which I can afford)  Or 30 year at about $1500 or so. 

 the question is since I do plan on renting out and moving In the next 3-4 years do I go 30 year and bank the extra cash for a rainy day/ future investments. Or pay the loan down in 15 years be free and clear and basically break even on the rent in 4 years. 

Thanks you in advance for any and all input!

—John