Customer of ours has just requested an MX with Advanced Security and some additional MR's. When i went to order the MR's i found that there are Enterprise and Advanced Security licenses for the MR's which i wasn't aware of. I know you can't mix the two licenses when it comes to MX's but can you when it comes to MX and MR's together?
Furthermore, whats the difference with the two licenses when it comes to the MR's? Searching online i didn't find anything too helpful.
As @PhilipDAth stated you can have the MX Advanced Security, and the MR Enterprise licenses. The MR Advanced Licenses are for if you want to do Meraki Adaptive Policy, or if you want to use the pre-built/simplified Umbrella capabilities that @RupertDot11 highlighted. Unless you're interested in either of those then stick to the MR Enterprise (you can upgrade later if you want). If you do go MR Advanced then be aware that you also have to move to the per-device licensing model too.