Prepositions in domain name

Hello, I want to buy a domain for a niche website

I have the choice between keyword 1 + keyword 2 + to + keyword 3
and keyword1 + keyword 2 + keyword 3

the phrase makes sense only with the "to", but I was wondering which one is better since google seems to drop prepositions when you search

any insight?

thank you very much

I don't think it would make much of a difference. If the keyword is mass researched with the preposition, say

cheap flights to boston, it would make sense to have the domain "cheapflightstoboston.com", and additionally "cheapflightsboston.com", would seem fine too.

But if you have the keyword "best places to eat", the domain "bestplaceseat.com" would not seem reasonable.

But it's all up to you. Just do whatever you think is the smart choice.