See, I would much rather have Choo, (and I'm a longtime Rios owner/sucker). Rios is such a wild card each year that you don't know if you get the tepid guy, the decent enough guy, or the 20/20 guy. He'll have bursts of great months, but then slip under a shell and not come out for weeks. Very unpredictable and frustrating.
Choo, on the other hand, is a victim of injuries. However, as evidenced by his previous years, gets a consistent 20/20 and .300 average. There is definitely that risk of re-injury, but I would rather gamble on the guy who has shown at least some consistency than a guy that is hot and cold.
In 2008 I may have agreed with you given how Rios was going. However, things have changed for Rios. This could be a good year for Rios, or it could be another bad one. Choo is a better gamble in my opinion.