adopting an older child vs. an infant, any regrets ?

Go for the two year old. I have had bio, adopted older kids, adopted a 3 year old - came to us as a 2 yr old and adopted another 3 year old - came to us as a 5 month old. Keep your options open always. Some times a bio sibling will pop up and fill in your family picture. Don't hold back. Go for love. You never know what the future will hold.