Take with a pinch of salt from some anonymous person giving you a single liner explanation on why MX is better than GEO.

A direct comparison is difficult because it depends on how long you intend to stay in the job, what is your likely career progression (e.g. taking up middle management or higher), as well as your perception of leave benefits, etc.

Bear in mind that salary aside, both MX and teachers have different performance bonus structure. Most teachers cap at GEO5, and most MXs at 11 or 11A, with the latter having a slightly better payscale. The average age to reach this sub grade may differ.

EOs have restricted windows to "take leave" but get "more" leave. EOs also have a CONNECT plan that adds $170k more over your career, an annual SEP of $500.

Having said that, some EOs end up in HQ and can have flexible leave taking arrangement instead of only being able to take during school holidays.

I would think specialised schemes (e.g. MCI has IO) would "pay better" (not looking simply at salary numbers) than the generic MX scheme, considering that they probably have reasons in each ministry to do so, due to differences in the remuneration and expectations of the job.