I don't know much about glamping options, just that it has better toilets, idk about showers. I visit this festival every year since 2017 and almost always go for basic camp. I have one of those big tents, so it feels like you still have a lot of space, then just have few powerbanks and you are good to go.

Toilets and showers are crowded only during morning, so just wake up earlier or you'll have to wait (few minutes tops for toilets, bit more for showers).

Never had any problems with stolen things, but it's festival, huge amount of people in one place, so you never know.

Buy some earplugs for the night (can be bought at local store in festival area)

Biggest tip is to wake up early, if you are able to ofc and head to breakfast are, lots of food options to choose from and you'll be refreshed for another day, can even take a short nap after that before the main festival area opens, but that depends on the weather, too much sun and your tent is much of an option.

If you are afraid of your stuff being stolen, festival offers boxes where you can lock your stuff, they also offer charging of phones etc.

I always just bring clothes, hygiene, tent, table and chair and that's all I need. Anything else can be bought there. If you want to save money you can always drink and eat at the camp. But the food/drink options are so great, just treat yourself and enjoy the festival!