Dan, stop reading right now and run over to the first place with your money in your hand and start banging on the door and don't stop until you leave with it in hand. They are not the Compact, they are both Universal's, which is the model prior to the Universal Plus. The reason I say go running over there is that the first one include the stainless steel bottom hook bowl, which alone can go for $100. The Universal, Concept, and Universal Plus all come standard with a plastic bowl with a center column, and the hook runs from above ( you can see the center column in the photo with the white bowl ) The problem with the center column is that at certain amounts of flour, and certain hydrations, the dough just wraps around the center column and does not get kneaded well. I have owned a Universal, and it worked well except for that fault. The Stainless steel bowl with the bottom hook is reputed to avoid that problem, do a search here and you should find some posts. IMHO, a Universal with regular bowl and hooks is worth between $100 to $175 , with the stainless steel bowl I would be asking at least $200. They generally last forever, mine was going strong when I sold it. The main difference, IIRC, between the Universal and the Universal Plus ( aka BUP ) other than styling, is that the BUP has a lower rpm at lowest speed, but otherwise the operation is very similar.
Also, the two extra hooks in the first ad have nothing to do with the bosch, they go with a KA. If you are looking for a general countertop mixer, you will have to buy the plastic bowl and some hooks and whips for the Bosch Universal, but for kneading dough, including pizza dough, the stainless steel bowl is all you need.