Any major difference between weld/bolt in subframe connectors?

I was thinking bolt in and weld after as well. I will be able to weld, but not sure I want to take the interior out and scrape off undercoating to weld the entire length. I am going to do it on a hoist, so after reading all the replies, I think I am going to buy the bolt in and weld the ends as well. I will get strength both ways.