Which of these two are best for someone who betting sports?

pinnacle

pinnacle or 5dimes and why?

This is discussed in the FAQ sticky on top of this forum. There is no correct answer. If you're betting teasers 5Dimes is the correct answer because I don't believe Betfair offers teasers. If you're betting cricket Betfair is more often the correct answer. Without knowing a vast amount of details including but not limited to your objectives, preferred sports, preferred markets, bankroll, currency, banking methods and many other factors it is tough to answer which book or book A vs Book B questions. But, if you have any specific questions I'm very knowledgeable about all three right down to their origins, histories, banking methods, currencies, markets etc. etc.

Sure thanks

Soccer, nfl, nba
2000€ bankroll
withdraw/deposit via skrill/moneybookers

So

Betfair, 5dimes or Pinnacle?

Obviously using all three to shop lines is the most ideal and having skrill that is easy enough to do. Pinnacle pays out to that method 24/7/365 in minutes. 5Dimes under 48 hours (most often 6-12 hours) and Betfair almost always following morning UK time.

When picking just one book based on what you shared, Pinnacle is my choice. They have on average the best odds of all three. Some reason to use the others:

Betfair - This is an exchange and if you do live betting, want to cash out equity or cut losses while game is in-play you can do this here. They also have more markets than Pinnacle.

5Dimes - First there's a downside that they only transact in USD. You can send them EUR and they will send payouts in same but this involves their exchange rate. There are reasons to use them however. They have a lot more markets for NFL and NBA such as props and most often better future odds and better teaser odds.

Pinnacle still the top vote. If doing in-play betting, props, or teasers might want to consider other options. For home/draw/away, DNB, handicaps and totals if using only one site Pinnacle is the nuts for those sports.

Thanks a lot for the detailed answer

with 2k roll you better split it around several books - bet365, 1***** and some of the smaller eurobooks