F-16's are like Vanilla Ice Cream. You know exactly what you're getting, and hey, it's still Ice Cream, which is always good. But there's so many other flavours to choose from, and most of them are far more interesting. You only ever eat vanilla if there's nothing else, or if it's got something interesting added to it. Which, in the case of the F-16, is the later or alternative variants that have cool things, like the F-16XL, or the Japanese F-2, or the Block 52+ F-16's that have better weapons, avionics, etc.