Both loans look great. The 15-year loan might hurt your debt to income which could potentially slow your growth. A mortgage for your primary is going to be on the debt side. A mortgage for a rental is different. Assuming the rent is higher than the mortgage and repairs, the net profit is on the income side.
In my opinion, the more important aspect would be your cash cushion for your first rental. If you buy a 200K single family home rental, I would want my cash cushion to be 15K, after all initial repairs. For your first rental, try to buy something with minimal rehab to avoid costly repairs eliminating your cash cushion. Once you get better at estimating repairs, you can get better deals that need more rehab.