They are the same. Order through Meyer as their prices are lower. Both are obscene for shipping charges, but that's what it takes to get just a few chicks to you alive and well.
MyPetChicken offers sexed bantams and is the only drop-shipper to do so.
How many chicks are you looking to order? From Ideal, the shipping is essentially free once you hit the $25 minimum order requirement. If you're going for more expensive chicks (or about 12 "regularly priced" laying pullets), it works out to be just a few chicks as well - though they will often send lots of extra males for warmth in cooler weather.