I'll try to compare the two. Fit: Sorahikos have more of a classic fit. Size down and they'll have a nice '47 501xx look to them. They taper down to the ankle, but not drastically. The seat is a bit relaxed. XX-003s have a pretty fitted seat, with a straight leg that's about equal to Nudie Regular Ralfs (at equal size, although a 30 in XX-003s is definitely smaller than 30 in RR). The leg opening is definitely smaller than the ralfs, however. For me, Pure Blue wins in this category. The seat fits especially well (though I agree the crotch area is a little bit close, much more so than 5EP or other American brands). Construction: IMO, 45rpm wins in this category. The Pure Blues are pretty experimental in how their made and have some interesting nuances such as thick threads with less stitches per inch, but the Sorahikos are really solid. They're both excellent, but I like the construction better on the R's. Denim: This is purely up to you. Sorahikos have such a beautiful color and the denim is super fancy, but they certainly have less character than the XX-003s, which are rough, bobbly and incredibly slubby. They're both fantastic, but my take is the 003's, because I already have a couple denims similar to 45rpm (5EP denim is very close). All in all, it comes down to price and preference. On a scale of 1-10 they're both 10s in my book.