I have the Ultimate box with two cards, and have loaded aproximately 56 to one card and 50 to the other one. They are the designs I use most frequently. I very seldom change what is on them. EXCEPT when I load designs FROM a design card to save to my computer so I can send them to my Bernina. They have all been pes or hus files. I LOVE my ultimate! Every time I go to the Bernina dealer for a sewing class, I just smirk when they try to push the amazing box off on the students.
However, I am sure all the boxes have some great features...it just depends on what you need it to do, I guess.
Ultimate Box & 2 cards Embird, Studio, & Font
Bernina 165E & Explorations Software
Joy frame and Brother 1500 quilter
40 yr old Singer with Cams
1918 portable Singer (hand crank!)