I think charting tools are one of the biggest parts of any binary options trading Software
A good candlestick chart is a must because it's easy to read price action. I also like using trend lines, support and resistance levels, and simple indicators like RSI or Moving Averages
Being able to change timeframes is helpful too, especially when checking the overall trend before placing a trade
For me, the best platform is one that has clean, fast charts with the basic tools I actually use, instead of adding too many features that make everything confusing.