well, you can start with either body, and if your situation dictates a smaller or larger objective, your not married to one. I've had a number of customer get both. for instance, a guy wanted to digiscope while he was shooting and got the 95mm for that purpose, he also got the 65mm for a sheep hunt, so you can change the optic to fit the situation, no other optic can do that. as far as the magnification and focus adjustment, having them both in the same place make a world of difference, and it's something you don't appreciate until you use it. the prominar 88 bested the older ATM and STM, but this is a new system, and we compared them side by side, the swarovski is better, sharpness, color fidelity, and edge to edge clarity. don't take my word for it, go check one out.