It depends on what you want to make. The bear pattern Cryket spoke of is more likely to be knittable, although you might have to mess with the row gauge (single crochet is pretty much square, while stockinette is slightly "squished".) The blankets might or might not be convertible. If they're light and lacy, lots of shell stitch and such, they probably have to stay in crochet. If they're more solid, panels of sc or dc, or cables, it's probably possible to convert them.
I have nothing against either craft and do both, often in combination. If you can knit, it isn't that much harder to crochet, and it's faster. I like crocheted lace better (and it holds up better over time), but to me, anything made out of vast stretches of plain fabric is better off knit because of the lighter, more flexible fabric.