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JK1. SGC - a bit tougher, but more consistent and better looking slabs.
2. Fees vary depending on how quick you want the cards returned and how much they are worth.
3. Ive cracked out numerous cards from slabs and have never seen a card stuck to an sgc, psa or gai holder. I think that is more likely to happen when you put a card into a screw down holder and you tighten too much.
4. I use ups or registered mail depending on how valuable the cards are - the more valuable, go with registered.
5. Look at the websites - sgc and psa both grade oversized cards. SGC also has a list of cards that it wont grade.