Q:

What infrastructure still needs to be built for Monero that Bitcoin already has?

Things like services and various other infrastructure that Monero will need before it goes mainstream?

A:

SPV / Light clients with high level of trustlessness.  
Fiat <-> xmr gateways. (sort of encompasses all of the below)
ATM machines.
Billpay-type services
Bitwage type services
Payment processors (so amazon can accept Monero)
Merchant infrastructure (so my local coffee shop can accept monero, kind of similar to payment processors).

