You can't really choose between 1 or the other. You could know the basics of evolution and ecology after 1 afternoon of studying.
I never studied plants in great depth and it paid off for me. I knew basic plant anatomy and classification (angiosperm/gymno, monocott/dicott,...)
Physiology sadly is probably weighted the same (I wish I had been more). I took classes in anatomy, physiolgy, ecology, and evolution, (nothing on plants), so everythig was review for me.