I am not a hardware guy. Other than playing with n-in-one electronics kits as a kid I haven't ever touched it much. I recently needed to build a "sensor pod" (my name) for my ongoing 6-camera high altitude balloon project. I got everything working on a breadboard and needed to move it to a more permanent PCB. Enter Fritzing[0].
I fell in love with Fritzing pretty quickly. It has 3 mode. Breadboard, schematic, PCB. I was able to copy my physical breadboard layout over to the virtual one. From that, it basically gave me a schematic (what I wanted) and a PCB layout (not entirely useful for me). I had to touch up the routing and fix some lines that wanted to connect VCC straight to GND. I was able to figure it out pretty readily and fix it all and now have a working PCB[1].
All this is to say, if you're a noob, Fritzing is great. This (circuits.io) is probably geared at non-noobs, and I'm sure it's fine for them. I am not quite able to jump right into drawing a schematic, though. As such, I can't provide much of an opinion on it. :)
I fell in love with Fritzing pretty quickly. It has 3 mode. Breadboard, schematic, PCB. I was able to copy my physical breadboard layout over to the virtual one. From that, it basically gave me a schematic (what I wanted) and a PCB layout (not entirely useful for me). I had to touch up the routing and fix some lines that wanted to connect VCC straight to GND. I was able to figure it out pretty readily and fix it all and now have a working PCB[1].
All this is to say, if you're a noob, Fritzing is great. This (circuits.io) is probably geared at non-noobs, and I'm sure it's fine for them. I am not quite able to jump right into drawing a schematic, though. As such, I can't provide much of an opinion on it. :)
[0] http://fritzing.org/
[1] http://goo.gl/iWuZF