Too many to mention.. but the things I would like to highlight:

1. nomnom is NOT the official musicoin pool. The musicoin developers (particularly funtek) were supposed to make an announcement to ask all miners to stay away from this pool due to repeated complaints - mentioned a few pages back.

2. I personally have mining rigs pointing to OrchardCoins. I was fed up with incompetent pools so I setup my own. If there were any missed payouts, I will immediately notice. Fortunately, all the payout problems are being detected and resolved automatically by sophisticated monitoring/maintenance I created myself.

3. We have an active chatroom where assistance is promptly provided. You can see in the chat history that there are no complaints. Even little questions are quickly answered and never ignored.
https://discord.gg/D5KUQ9N

4. Transparency - when a block is found, how are the earnings distributed? This is displayed in realtime at OrchardCoins. I understand this is too technical for some people but it is very important to show this. Otherwise, miners cannot confirm if the profit distribution is being fairly done. "Payments" section is not sufficient because it doesnt display the pending payouts.
http://music.orchardcoins.com/#/transparency

5. Android App Mining Rig Monitor - handwritten by myself, it provides real time alerts in case any of your rigs stop working. It also tells you how much you earned in the last 24 hours to help you track your daily earnings. This app is a proof that the pool is being maintained by someone technically competent to provide additional services.

PS. In the latest OrchardCoins chat, you can see the hardfork upgrade took only a few minutes to be completed at OrchardCoins. Compared to nomnom's tweet saying he needed a few hours of downtime to do a simply upgrade - this is proof of difference in technical competence in running a pool.