It wasn't clear which product you were referring to. You mentioned 'trade' which I suppose means 'trading'. Investing is a different thing and needs a different mindset.
Overall I've stuck with IG because they appear much more transparent than other reputable brokers (my experience in CFDs and spreadbetting).
IG also offers ProRealtime (PRT)inclusive for those who trade/invest regularly. I don't think any other broker offers this as inclusive. The PRT platform offers significant advantages too many to mention here. YouTube tells more. At first PRT seems daunting but practice over a few months brings out its advantages.
I've found IG to be quite responsive to occasional platform issues. If you're English speaking you may encounter communication difficulties if you call outside hours. On occasions I got transferred to an English speaking person sounding like of Chinese origins. Though they speak English well, from my experience they don't appreciate subtle nuances of English as spoken in the UK. Out of hours services is pretty limited but better than nothing.
Spreads are not as great for some currency pairs and other instruments - though IG would say differently.
IG is also quite a Global operation with decades of experience.
So overall I've stayed with IG, all considered.