Hmm. I'm going to try and explain this as someone who usually goes to the ILs at Christmas, not my parents.
We live within an hours drive of all DHs family.
My parents live 4 hours away.
We usually all gather at MILs at Christmas. She has a big house, 3 bathrooms, plenty of space for everyone, a big kitchen and dining table.
My parents live in an absolutely tiny house (by choice, not due to finances, they could afford much bigger) with 1 bathroom. If we were to stay over it would mean on a blow up bed on the living room floor. Downstairs is open plan.
At my parents house I feel pretty claustrophobic. I hate sharing a bathroom. They often have 8-10 family members perched on the floor/makeshift chairs around the living room. It's very loud. The tv is always on. Christmases we're like this when I was a child and I didn't like it then. It was too loud, too crowded, I found it stressful.
My ILs are quieter, it's a more chilled day, there's enough space for everyone to sit on a chair/sofa.
I much prefer Christmas at ILs than at my parents. We/MIL often invite my parents to us, but they prefer to stay home at Christmas.
So we often have a meal with them the weekend before. I simply don't enjoy Christmas much at my parents house. I don't like doing a 7-8hr round trip to sleep on the living room floor, having to stay up til 2am until the last family member leaves, and then having no space or privacy in the morning.
I love my parents of course, but we're not alike, and we don't enjoy the same type of day.