The main difference between the standard, stainless, and deluxe models is the spindle. The Deluxe model uses Aero-S steel. Aero-S steel is extremely strong and allows the use of completely hollow spindles for lightweight. This is superior to titanium, as titanium has weight limits when used in small diameters such as pedal spindles and isn't as stiff. The Aero-S pedals have no such limitations, and as such, are much stronger than a comparable titanium pedal.
High tech comes at a price.
The Bebop clipless pedals are light, durable, and dependable. They require low maintenance and are easy to use. Well, the price is a bit high. If this is in your price range and you live in muddy conditions, this is the pedal for you. As for me, I'll be using these pedals for a long time to come.