Yes, there are far more programs for EM compared to EMIM. However EMIM has a much smaller applicant pool. In general if you are not competitive for EM you are unlikely to get an EMIM spot; EMIM is similar to or a bit more competitive than EM.
The combined programs are pretty similar in competitiveness to straight EM. Some people say a little more, some people say a little less. There are fewer programs but there are also fewer people interested in spending an extra 2 years in residency for equal or less pay.