how much are you willing to spend ? is the question.

If your answer depend to mine, I think it's better if you give all possibilities, so everyone can find his answer...

less than 50$/ monthly -> This more than ***/monthly -> this ...

For my personal case, i want to start with small budget (50$ monthly max ?) and increase if needs.

AWS has a free tier, first year free upto some amount of usage, and that limit seems to be okay for startups. If your application is expecting a lot of activity and needs scaling up within months then AWS should be your choice.

DO is definitely less costly, but it's hard to compare AWS with DO.

Setting up procedure would be same for both.