EE at
Epic is a bit of a bust IMO - its packed.
Id do a split stay myself - that way you are near Epic for your Epic days and you save a bit - maybe.
Price it out both ways as you often get a bigger discount for staying more days.
Keep in mind one night at HR gets you two days of express and then you could do two nights at Stella.
I would not bother with Helios - everything I hear is the rooms are not much different than Stella and Terra other than the view of course. save the money and go to the Helios bar for the view.
Also I've seen a lot about the EE at Helios being a disadvantage as the main get typically gets to Nintendo first.
All that said staying at one hotel is far more convenient - you may not be able to check in until 4PM and that bus ride to Epic can be a nightmare depending on traffic.
If money is less of a concern than just staying at hard Rock is probably the best bet.
In 2026 I am pretty sure the 3 day ticket includes 3 days at Epic if that is what you want - unlike the one day now. (those tickets don't seem to be available yet - but I've heard that is how it will be)
It might be best to do some time during the day at IOA\US and then take a break and go to Epic for the afternoon\night.
It seem like after the morning\midday rush people head out of Epic as its a long and tough day for a family.