If it is a real macro site, I prefer the 60. The 30 is for larger stuff. It is too hard to get close enough with the 30 to get good magnification and still get some light on the subject. It is sharp and focuses fast, which is nice. And cheap, which is nice.
I think I got it, thank you. For me , the 60mm is sometimes "too much magnification" for some animals so the 30mm appears to be the lens for these animals. Thank you!!