The answer is difficult and depends on several parameters specific to your personal situation.
To make it simple, the fixed rate is better for you if you borrow on a long term (more than 15 years) because it offers security. If, on the short term, a high increase or decrease in rates seems unlikely, nobody can anticipate their evolution on the long term (increase of your incomes, need for other financings, etc.)
On the other hand, variable rate is better for you if flexibility is for you the most important criterion because your financial and professional situation will evolve in the next years (increased revenue, need for other funding, etc.).