When you're a 1 man show, you need to both save your own time, and compute costs.
To save your time, use the simplest thing you know how to use. Whatever you can set up easily and gets you serving a hello world on the internet.
To save compute, just don't do stupid things. In particular, you should consider what happens if this project isn't a runaway success. One day, you might want to leave it running in 'maintenance mode' with just a few thousand users. For that, you'd prefer to be running on a $10/month VPS than a $2000/month cloud setup which is going to require constant migrations etc.
Things like automatic failover and loadbalancing are seldom required for 1-man shows - the failure rate of the cloud providers hardware will be much lower than your own failure rate because you screwed up or were unavailable for some reason.
To save your time, use the simplest thing you know how to use. Whatever you can set up easily and gets you serving a hello world on the internet.
To save compute, just don't do stupid things. In particular, you should consider what happens if this project isn't a runaway success. One day, you might want to leave it running in 'maintenance mode' with just a few thousand users. For that, you'd prefer to be running on a $10/month VPS than a $2000/month cloud setup which is going to require constant migrations etc.
Things like automatic failover and loadbalancing are seldom required for 1-man shows - the failure rate of the cloud providers hardware will be much lower than your own failure rate because you screwed up or were unavailable for some reason.