Little bit OT... Maybe you can help me making a decision...
We want to go to epic universe next year. Originally planned this year but we changed for Mexico

its my son's and my partners first us visit and my last time is 15 years ago. So I am hoping to make the best Out of it.
We could go over Easter (April) , in the summer (end of July), October (we are no halloween fans) or after Christmas. What would you prefer and why?
OK so, I'll answer as generic advice for Universal because we really have no idea what Epic is going to be like.
I'd choose October first. Even without the desire to go to HHN, the weather is nicer (provided we don't have a hurricane season like this year) and while HHN typically gets very crowded, the parks aren't that crazy if you are avoiding HHN.
I'd choose July second. I'm not sure how you handle heat, but July will be hotter than all hot, but the heat can be manageable, especially if I don't react to heat like Tim.
Personally, I would avoid Easter and the week after Christmas as an absolute last resort. I'd probably do Easter before Christmas.
Who knows what the heck Epic will be by then, but if you are doing the other Universal parks, I would recommend staying at one of their resorts that offer the Express Passes (Hard Rock, Portofino, Royal Pacific) because it really helps with the lines and often times, if you were to subtract the cash price for Express, the room cost is basically nothing. I can't say whether it would be worth it to stay at Helios for visiting Epic because it hasn't opened yet.