I woudl say it depends a littlf on the stage of development of your plant. If you have a mature tree, you could consider defoliation. And yes, for leave size reduction you take all. THat being said.. If you want to grow fruit, you need all the energy you can get.
Best way to reduce leaves is increased ramnification, and age. Overtime a tree will reduce leaf size if grown in a small container. So I would just let it be. In some 10 years the foliage will be smaller.