Purely in personal experience over time, have seen and read more moaning about IG than Saxo.
But as demo accounts won't cost you, then it's a matter of which platform you find easier to use.
When it comes to costs for the real thing, then there's little to choose between them..
£8= /trade + ~£8= / month in custody fees. -cheaper as you trade more [10+] over time.
But beware of extra hidden charges in the small print, especially at IG.
Reasoning- IG's so-called 'transparent' fee structure is at the least, complex and overpriced, and at worst, baffling.
& tends to change with the wind, market conditions and every little whim.
Inactivity will cost you dearly !
Both are actually good brokers. You will have to be more specific in terms of what you’re looking for in your broker. Like the reasons, I trade with IB and Coinexx are their interactive interface and variable leverage. Lowest spreads of Coinexx are also a big plus for me.