Most of the users have telegram here and they ask to trade there? Is this ok?
Depends on the level of security measures you both are going to adhere, and when the party asks you to go first and says a 'NO' when you ask to go for an escrow, it's likely going to be a scam. It's better if you do it through a medium of exchange rather than going for telegram, as the scammer will also have the option to "delete their account" immediately after they succeed in their intentions.
Or it's more likely to get scammed when using outsource of the forum to trade?
Not necessarily, but as said, you need to take extra care while dealing with people over telegram. It's better if you trade with the people you know personally (or at least know very well). If not, going for direct trades over telegram would be like striking a hammer on your head. One more thing, as you've discussed about telegram, I'd like to make you aware of a fact that people over there have created fake admin/exchange/celebrity/support accounts and you need to be very careful when you get any messages from them. Example of all these is given below:
- Admin of any exchange will never PM you first, if anyone comes to you claiming he's admin and could help you in your case, straight away "Report spam" as well as report them to the real admin you can find in the specific group you're dealing with, as well, block that person who tries to scare you by saying that your account will be blocked on the exchange and/or site you're referring your question to, and asks you in various ways to send ETH to them if you want your account/funds back. Never trust such people. The same way, any celebs or customer support will never PM you first, and won't ask you to pay anything in lieu of getting served by them.
Most of the users have telegram here and they ask to trade there? Is this ok? Or it's more likely to get scammed when using outsource of the forum to trade?
I agee with others that you can get scammed by individuals in telegram or even here.
the only adequate and secure way is to use an exchange platfrom. yes, you will have to pay some commission as spread or whatever but you will be sure that the transaction is secure.
OP can do secure trades over Telegram as well, as there are escrows here who can be a part of such deals. But the only thing you need to do is, PM escrows instead of asking them publicly here as most users try to create fake profiles with almost same username of escrow here too and try to scam people by watching such public messages and then replying the user who may become their possible victim. Escrows also charge a fee the way you mentioned for exchanges, and are a good way for deals over telegram, but yeah, I'm against direct deals there.