I think both platforms are ok, everyone will find what is best for him, I use MT4 from Hotforex because, I guess, I'm used to its design and functionality. Also a lot of work done in the platform and I'm not sure if transition will be smooth.
Metatrader 4 and Metatrader 5 platforms are the most widely used platforms for Forex trading. We should not stop using MT4 or MT5. You can trade on these platforms from anywhere and from any device. You can put large volume trades in these platforms without even getting your trades freeze.