The thing to keep in mind when deciding between the 60 and the 100 is what your subject matter is going to be. If you plan to shoot critters with it, remember that a 60 will make you loom quite close, with your shadow often your biggest obstacle to a good shot. Insects in particular do not want you that close and will scramble to get away. The 100's longer working distance is better for wildlife macros.
The 60, otoh, is smaller and lighter, and still ideal for tabletop object or flower macros.
I own the 60. My other hobbies include collecting vintage fountain pens, and folding origami.
The 60 fits my choice of subject matter perfectly. But I can certainly testify that it's nowhere
near long enough to be comfortable when shooting tarantula hawks (giant wasps).