You need replies from people who have used both, and can offer direct, personal insight into each from their own experience.
That's not me (just so you know).
I'm a former forex trader (now trade mostly futures and some spreadbetting).
I did a lot of "due diligence" about countless brokerages, and have used many over the decades. I've never used forex.com. Every time I did any "due diligence" I quickly ran a mile from looking any further at them, and decided long ago (and on more than one occasion) that I wouldn't touch them with a barge-pole. I appreciate that this, in itself, isn't helpful to you as I can't now remember why enough to go into any detail. But for what it's worth (if anything) I have an overriding impression that it's far from a good brokerage.
Oanda I've used extensively, over many years (still have a little account there but rarely use it) and I feel I can recommend them. I've always been satisfied that they're honest, reliable, decent and ethical. They're a counterparty market-maker, of course, not really a "broker" at all, and (unlike many) they say so fairly openly and honestly.
My own impression (after quite a lot of varied experiences with forex "brokers" over a long time-period) is that if you need to trade with a counterparty market-maker, there are certainly many truly horrible ones around, and that you're really going to have to look long and hard to find a better one, overall, than Oanda.
Personal opinion only, of course.
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