As far as ease of care goes I dont believe that one type is easier than another. Some, like crocea, are simply more light demanding. Size does matter in my opinion as you've discovered through reading; smaller and larger clams seem to be touchier with mid size being the better choice. If your tank is stable and mature and you dont have any fish or inverts that will try to eat one you should be alright.
BTW I have six currently. Two crocea, two maxima, a squamosa and a derasa. I've had three die in the past. A little maxima within its first year, a squamosa after about two years and just recently my big 5 year old maxima. The two crocea I have have never given me any problems in the 4-5 years I've had them which is why I say that I dont feel one type is easier than another.
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