MythosHF

I've only used the CFA books for Ethics, summaries and E0C questions. I only used Schweser for my Dec attempt and now using Elan for June.

You're fine with using either really though I would give Elan the edge. The point of study guides is to focus on what you need to know and to explain the material very concisely and clearly which they do really well. For eg you really do not need to know how to calculate the pooled variance etc. The LOS are very clear on that.

You have started early and are apparently doing a very thorough job so far. Keep it up and you'll be fine. Just do ethics from the cfa books and the rest you should be fine with a prep provider.