So, I've been on the Powershell journey for about 8 months now. I started with Learn Powershell in a Month of Lunches. After that, I started putting my knowledge to use in my environment, creating scripts using the AD module. Most recently, I've been putting my knowledge to use creating scripts that interact with Exchange Online(We just moved our company to Office 365). Needless to say, Powershell has been of tremendous value.
However, I'd like to continue my learning in a more formal fashion to fill in the gaps in my knowledge and wanted to get the community's advice on which book I should purchase next.
Learn Powershell Tool-making in a Month of Lunches or Powershell in Depth?