How competitive is it to get into either Accelerated or traditional OCS for the FL ARNG? ?

Every state is different. I went accelerated with the NCNG. They had a board and out of 27 only 6 were selected. They lean heavy on prior service usually. They just don't want to send anyone. It is a pretty instance course.

When I was in the FLARNG they attempted to persuade every person in my unit with a degree nearly every drill to sign up for state OCS, so my assumption is that it is not terribly difficult to get in to. I am only aware of one Soldier being sent to federal OCS, and he was not prior service.

I commissioned through NCNG Accelerated. Like 1LT Rosa said, we were boarded and our group selected was all prior service. Every State is different though due to needs of the State. I second the comments about how intense it was. The POI is the same as active duty but your are doing it all in 8 weeks instead of the 14 they have. if my memory serves me right, it was 05:00 wake up and you didn't get to hit the rack until 23:00. It's basic training all over again but with leadership roles for everyone and more classroom focused.
The Traditional Course is a grind in another way though. You have to look forward to two years of getting your but handed to you during the weekends you have to go to drill. Personally, I preferred to get it over with.
The biggest thing about OCS is to take it stride, remember your goal, and embrace the suck either way you end up having to suck that egg.