My plan is to see how I tolerate levothyroxin, and if I continue to tolerate it well, I'll stay on it. If I find myself not doing well on it, I plan to switch to the Armour Thyroid. But so far, knock wood, I feel great on the levothyroxin. It's been about 8 months and I have great energy and feel really good right now.
I have a friend who is hypothryoid and was not doing well on the levothyroxin - constantly exhausted - and switching to Armour was a huge improvement for her. I know it's a great medicine. But I have not switched yet because (1) I am doing very well right now, and I don't want to rock the boat, (2) it's more expensive , and (3) it's nice to know there's an option waiting in the wings if I need more help/better meds later.
I'm glad you are feeling better on it! Slow thyroid is just so debilitating - people don't realize how insidious and pervasive it is, but it really affects just about all of our bodily functions, including cognitive function.