Saxo Bank’s solid for indices. Their DAX and FTSE spreads stay tight all day. The platform doesn’t crash during news events like some others do. FP Markets is worth checking out too. They offer clean fills on US500 and have rebate programs if you go through an IB. Don’t get hung up on spreads; test execution first. Drop small trades during NFP or Fed days to see how they handle things when it gets crazy. Most brokers either jack up spreads or start rejecting orders when volatility hits.
Switched from forex to indices last year and went through the same hunt. Picked ThinkMarkets after trying their demo.
SPX500 and NAS100 fills are solid during main sessions. What clinched it was their performance during March’s insane volatility - no requotes or platform crashes.
Spreads do widen on news but snap back quickly. Their partner programs have decent cashback rates too.
Test their demo first. Run it during London open or US close when things get wild. That’s where bad brokers show their true colors.