The 100 is the most used. I like the 180 as it allows me to be further away from my subject and get macro shots.
The EF-S 60 has the limitation of needing to be close to your subject. Also that lens is meant for APS-C cameras which is what you have. If you ever plan on upgrading I would invest in a lens that can handle a full frame sensor.
The MP-E 65 is really a specialty macro lens and is meant for extreme close ups. To achieve these close ups you need to be able to get right up on your subject. Not easy to do with coral.
Here’s Canons Macros. Be advised you
can not use the RF mount lenses.
Shop our selection of DSLR Lenses. Explore specs, colors, and more from Shop Canon Business U.S.A., Inc. to find the right product for you.
www.usa.canon.com
The most versatile at a lower cost lens is the 100 and what I would recommend. The IS model can be found on sale many times. It’s nice for the image stabilization capability.