I would shy away from doing a different per table unless it is open seating with the type of cake disclosed so people can pick.
I would be stewing on the verge of tears if i got stuck at a table with a cake I did not like. The idea of a wedding without cake. . . . well it would destroy the reception for me. I just sit there totally depressed and POed my craptastic luck. (I get bitter about getting a raw deal do to stupid luck, i find it incredibly depressing)
This might also not go over well but i have to say my piece. Cheesecake is not "cake" Just like a doughnut is not a brownie, a cookie is not icecream, and eclare is not a pie and a tart is not chocolate souffle. It was poorly named. It is valid dessert, and if you want to have it instead of cake at your wedding, ball all means do, same as if you want a doughnut tree, but don't call it cake. Don't offer people "cake" and give them cheesecake, offer them cheesecake. Nothing sadder than looking forward to a cake just to get disappointed due to stupid terminology cakes have flour and yeast. If you are familiar with Reddit this is a total troll face for me.
Along that line, I think if you are doing, regular cake, tiramisu, cheesecake, etc., I think you do need to order way way more. They are just too different of desserts (yes think of them as deserts, rather than cakes) and I suspect people will be more inclined to try more than one/many if they are sooo different. Sorta like if you are doing cake and ice cream, you get one of each, not either or. I suspect that if you stick to more variations on a basic cake people may be more likely to pick one than sample all. I am struggling to word this well, but it seems more human nature that if you have options that are very different, that you do one of each rather than picking.
Now having extra desserts is not a bad thing, go for it. Just be sure to plan accordingly, and i doubt many people would be to sad at one less side dish, but more desserts.