Malaysian marry Bruneian

Assalammualaiakum and hi.

I want to ask question and opinion. I'm Male 25 from Malaysia and GF Female 20 from Brunei.

1. I'm curious what's the average cost of marrying in Brunei. I know there's the adat and everything, so I'm curious about how much would it be.
2. I'm working in IT, and I notice that IT job in Brunei is not much, and if there's of course they would prefer local. So do you think living in Brunei or Malaysia is better in the long run in term of career and lifestyle.

Thank you so much for your response !