Hey, here's my three EDC options.
Right now the Aviator is my most often carry. It's red and white light, smaller and lighter than the other two, and has the clip. It is also the most expensive, but for about $120 used, it was worth it for piece of mind.
The G2 has been one of my favorite carrys ever. It is not the most robust light, but it's served me through two tours and several subsequent years of carry. I had this one stippled by Damatos Custom and it's very nice and grippy. Much cheaper, find them used with the nice KX4 head for about $40 shipped on the EE.
The last one is a Pentagon light. They don't make them anymore because of a lawsuit with Surefire. It's very sturdy and solid, but heavier than the others. I paid about $70 bucks for it and a single cell light together.
When I carry just in a pocket, I go with the Aviator, when in my bag, I usually keep the G2 or Pentagon light.
I had the lowest version of a Streamlight (like a G2) and it would randomly cutoff when the button was still pushed. I assumed it was a connection issue. Tried different batteries and pressure combinations. I couldn't trust it so I just gave it away. I'm sure Streamlight has good lights, but I didn't go back.
Hope this helps.