I've played both and it really depends on what you wish to do. BH can heal and Tank and Sith Inquisttior can stealth, like in warzones of backstabbing someone, I'm always able to get the first HIT

How many people are playing this, looks bad with locked servers

After July 18th I won't be renewing, rather spending my monthly payment on something else.

My luck is the server merge will happen after my 6 month sub expires in middle of July here.

Waiting to see if they do server merge before my six month sub expires.

Depending on how long you plan on playing this game here I would just try every class and over time you see which class story you like or don't like here. Everyone has their own opinion on what they like or don't like here. My two cents.