Everyone will use a term that they feel comfortable with. This forum differentiates by accepting that Transgender is an umbrella term for the whole spectrum, whilst Transsexual is the term used for those are transitioning from their assigned gender and will then live their new gender on a permanent basis.
In the UK, the government have made the differential within their equalities legislation by specifically by using the term Transsexual as a protected characteristic , this has been further refined by specifically
identifying their interpretation of a Transsexual person.
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I would suggest you have a read of the postings and profiles of both named moderators of the TS section, both of us are Transsexuals, as is another moderator on the forum