It will be best if you find someone here as they are already accustomed to the lifestyle and have gone through the "struggle" so your mindset will be more similar.
At the same time marrying someone from Nepal is not the end of the world but there will be a wait time before you can bring here and at the same time her expectation could be different than reality. And perception/attitude can change after start making $$.
Regardless you need to find someone who you think will be compatible for long term happiness.