It depends which one is more favorable to you. In such cases I usually advise to test all of them. If you have trading experience, then you probably tested MT4 software as vast majority of decent brokers offers access to this platform. Try Doto custom one. It's a solid alternative and it doesn't concede in performance. In some cases it may be even faster, and of course the number of instruments available for traders is immense as well.

If you are new to this forex industry then I certainly recommend one of the MT platforms. They are the standard of forex trading therefore they will give you the right impression of how to use trading platforms and what they are for.

Conversely if you are an experienced pal, then pick Doto platform. It could give you a different perspective on the trading platform. For me it's always exciting to explore some new platforms or assets.

Never tryna impose my personal opinion, but I know no better than MetaTrader 4. Yeah, I'm from that category of traders who barely admit the existence of alternatives to it.
Even metatrader 5 isn't seem to be so delightful as 4th version.
For the sake of the justice, doto's proprietary trading platform is also quite appealing. I've quickly skimmed through its technical characteristics and should say that it also can become a good choice.