Kind of asking what company is better to make your suit? Each is known for their work, the prices are different and the practices are similar. All have there pluses and minus. To me I would not have a graded coin, unless it was a questionable purchase of a high dollar coin. To me they are in the slab child proof. I pay nothing extra for a slabbed coin. Even in a slab they are not always what you really want. Other things factor in to me:
1. Is the coin what is what the slab says? (Variety) Sometimes theses are incorrect. So I buy the coin, not the plastic.
2. Does the coin have
Machine Doubling on it? Some slabbed coins have this issue and it is ignored. I prefer to not have this issue on the coins I buy. But no mention of this issue is on the slab.
3. Die state: The VLDS (Very Late Die State) coins sell for the same price as a VEDS (Very Early Die State). Again no mention on the slabs. To me that is most important. (Someday soon it will finally sink in that the differences are important to serious coin collectors.
4. Some take the prestige of thinking this coin is slabbed. To me it doesn't matter. What I see on the coin is more important than what the slab says it. Know what you are buying first, before buying a coin. Just like buying the suit, the person in the suit is the one that determines how it looks on him. So if you need to be spoon fed a coin, learn why you should want that coin first. +/- are your determination. Your buying the coin. Only in the case of a super high dollar coin is it necessary to have it in a slab. (Then you have to accept that they are correct, before buying the coin) To me, buying the coin is more important than buying a slab.
5. Something obvious doesn't need to be slabbed. It reduces your profit and I pay nothing extra for a slab. But it is your choice. (I'm sure others feel that way also)