eGo-T hands down. As a 17 year smoker who made the switch, I too was concerned with size and weight of my first one. I liked the 510 I bought - its a solid unit. I quickly became irritated with the battery life, so I decided to upgrad to the ego-t. There is no comparison between the two - ego-t is incredible. My advice to you is don`t put too much stock in the shape or size - you need something that will be functional and not a pain in the .... You said you are hardly at home, and this to me says stay far away from the 510 series. You want something with a battery that will last all day. The ego-t does. The other bonus is that you can fill a couple tanks to take with you for refills throughout the day, instead of having to mess with leaky cartridges, or direct dripping all the time.
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