METV is a 6 month visa that you have to depart every 90 days..you can get a total of 9 months out of it with a strategic last 2 day visa run
DTV is a 5 year visa where you have to depart country every 6 months
You can get extensions on both visas in country but it’s just way easier to do a border bounce, border run, microcation, minication or long vacation to reset the visa for its next duration of time
People usually opt for the DTV due to the longevity of the visa
The 5 year Elite visa costs more but you get way more benefits in country like opening a bank acct and once per year departure