Need 1 day 2 park passes. Is it better value to wait and purchase at the gates on the day or will that’s be the most expensive way. Our hotel a short walk away has a universal run kiosk but unsure if the day tickets will be same cost as the gate.

Cheaper online

Get them online

And use the app to purchase. Saves you from needing to do will call and gets you into the park quicker! If you wanting to use the Harry Potter train make sure that's included. If you also have the extra money the line quick pass is a get option, will allow you to do every ride in both parks in one day!

Get them beforehand. Better option.

Get tickets beforehand and online

Use undercover tourist and buy them online. They can do e tickets if your trip date is within 2 weeks.

Its definitely cheaper to get the tickets in advance. I recommend with the park hopper option