Keep in mind that the tec pass is useful only for GUE tec courses. Another requirement for GUE tec courses is a minimum experience of 100 dives (and, depending on the case, instructors may suggest you dive even more before enrolling on a technical course).
So, if you really have less than 49 dives, as your profile says - don't even think about the tec pass, simply because you don't need one
I don't find doubles harder than a single, but it's personal. On the other hand, I see way more complicated the management of a drysuit.
Now, you have two options:
- do some premier courses (drysuit and/or doubles) before the fundie, possibly with the instructor you chose
- enrol on the fundies without previous experience
Fundies with doubles and a drysuit can be complicated if you don't have previous experience. If you get a provisional, you will have only six months to upgrade to a rec-pass for free (after that, you will have to pay the inscription fee again, if I remember well). So, if you can't dive AND practice a lot after the course, I suggest you start with some specific training for the drysuit and/or the doubles. Otherwise, just go for the fundies; even if you get a provisional is perfectly fine (I did
)
By the way, the solution to all these problems is simple:
- identify an instructor you like
- speak with him