All of them are quite convenient as I think. In fact, from the point of performance, through the prism of my experience of trading using both web version and the desktop one, there are no complaints. Maybe, I can confirm that web version can slightly lag behind the performance of the desktop one, and maybe the interface not so convenient, but it's only my point of view. It's all about tastes of every trader, you know. So, choose whatever you wish, or test both and then make a decision.

I realize that using the web version of this platform is quite convenient. And as far as I understand you can open platform on any device.
But it seems to me that desktop version of platform has more advantages. At least it doesn't depend on browser. And as far as I know, you can't install custom indicators or tools in the web version.
And besides this broker doesn't have a web version of platform as far as I know. So I trade here on desktop platform and I am happy with it.