sorry for not clarifying.. The embassy asked me. Immigration asked for nothing but I guess they can check any time if you you still have enough money and so on. Sounds bad but if your are not from a good country you better get an onward ticket
for sure a visa sticker gives a much higher chance of getting in cause its not a visa exempt. The officer will assume the embassy checked the conditions already before issuing the visa. Despite the higher chance they can still refuse entry if they want to but still... its a higher chance than coming with nothing.