most likely players on F2P will recommend F2P and players on P2P will recommend P2P

it depends on what YOU desire, here are many threads about these 2 servers and their pros/cons (for example look at the thread in my signature)
1) on free to play server there is a good population, but ofc most are endgame-players
for dungeons this is not a problem as there are mercenaries (strong CPU players) which are available at your will everytime so you dont have to search&wait for others
i dont know the exact situation on subscriptionserver but it seems they have a very small poulation
2) from what i read shippvp happens, there are players that really like that and do it regularly
3) good farmers or traders make around 300 BC / day, there are some who make even more and some who make less
average players will make less most likely; this strongly depends on what activities you do
also it depends on the exchangerate, which is determined by the amount of BC / gold and gold/BC players exchange