My new favorite - Hogue AR-15/M-16 OverMolded M-LOK Hybrid Forend Polymer Grip

I absolutely love this grip. You can hold in any number of ways and more likely than not find something that feels perfectly comfy for you. I personally don't like fully gripping a vertical foregrip, but also don't like the angle of some angled grips. This one let me find my perfect middle ground. Only possible thing I can think of as a downside is that it does take up more room than regular foregrips, so if you have limited space it may not fit.