Lara Sophia has a lovely rhythm. Sophia Lara is harder to say.
However, we chose the order that didn't flow so well for DD simply as we wanted her first name to be her first name IYSWIM.
If you have no preference for first name, and it still scans better when you say it with your surname then go for Lara Sophia.
But if you prefer Sophia as a first name then Sophia Lara is lovely too.