Transdermal vs Intra-Muscular

For those TG individuals with some experience, I have a question (or to those with the appropriate medical knowledge).

When I began estrogen several years ago, I started with oral (pills). My doc switched me to an injectable form, which I am still on. Because of rising costs and my new insurance not covering the IM form of estrogen, I was considering asking my doc about switching to the transdermal form, which is covered by my insurance (at the lowest co-pay as well).

Does anyone have any experience with both of these that can give me an idea of how they worked for them?

Thanks,
Stephanie