The fact that you’re asking indicates that you don’t understand the difference between a real broker and a counterparty market-maker.
Of course Oanda is a counterparty market-maker (and by the way it’s one of the best, most reliable, most honest and best regulated ones in the world).
Here’s how you can tell the difference: if a broker is charging a commission per trade and has a spread of 0.1 pips on EUR/USD, it’s probably a genuine broker. If they’re charging spread only and have a spread of about 1.0 pips (or maybe even more) on EUR/USD then it’s definitely a counterparty market-maker, whether they say so openly on their website or not (they sometimes don’t - it depends who regulates them: they may not have to!).
Simple as that.
Don’t be fooled by people claiming to be “ECN” brokers or any other initials, either: these mean nothing. The method described above is the way to tell.
You’ll need plenty of capital to trade with a genuine broker. Almost nobody in this forum does.
If you want a good, reliable, honest market-maker, you’re probably not going to find a better one than Oanda.
I haven’t used MyFxChoice myself - and wouldn’t.