There are a couple of minor reasons for a couple to file for separation instead of divorce, such as keeping one spouse on another's health insurance or to keep paying taxes at the married rate or because the spouses to meet the residency requirement to file for divorce in Florida, but those don't appear applicable to your case. The main reason to file for separation is a psychological one: it allows a spouse to receive alimony and/or child support while the couple works on the marriage, perhaps through counseling.
But separation in Florida isn't as extensive as it is in some other states. It only allows a judge to order alimony or child support. A judge in Florida can't declare the couple legally separated as is allowed (and sometimes required before divorce) in some other states.
Filing separation is uncommon in Florida because, when one spouse files for separation, the other just thinks "I'm not paying alimony," and countersues for divorce. A divorce case always trumps a separation case.
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The advice which you previously received is correct. While many couples become "legally" separated and some in fact remain that in that status for an incredibly long time, Florida does not recognize, therefore nor does it provide statutes, procedural rules, and/or other administrative guidelines for the many analagous issues with which "legally separated couples", particularly those who share common biological children, would ultimately be forced to contend by necessity. I always encourage couples, particularly those with children to attempt reconciliation first, and merely a perfunctory attempt, but a bona fide effort that is not halted the first time the a given couple has an argument during a session. You indicate that you "are not planning reconciliation", but not that you have given up on the possibility entirely so I would as always recommend you try family counseling. If, in the end, it does not work out and you are convinced that divorce is inevitable, take the bull by the horns, file first which will place you as the petitioner which in my view has some advantages and if you want to know why you might choose one path over another, consider whether or not you would like to have your credit destroyed by the next guy she meets; allows to move in with her; has big plans but no job; and for whom she feels sorry so ultimately uses credit cards for which you both, as a married couple have responsibility to buy him nice tailored suits, Italian shoes, etc., which he never wears to a job interview, but does allow him to pick up his next soulmate as a better dressed man. LOL.
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As my colleagues mentioned, there is no legal separation in Florida. But it is common to come to terms on a separation agreement or alimony/child support prior to a divorce being filed on.
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