Welcome, LightItUp!
Juices vary from vendor to vendor. It's a shame that our tastes aren't all alike. If they were we could depend on several people's reviews to key us in on the best vape. BTW, we differentiate between smoking tobacco and vaping E-juice so that everyone knows what you are referring to. Smoking means burning leaves in a paper tube. Vaping means creating smoke-like vapor from an electronic cigarette. (grin)
The 510 is a good choice and many of us have them, as well as the Ego or one of its counterparts. The Ego is a good work vape, especially if you buy the mega atomizers and the mega carts. The mega cart will hold 26-30 drops with a dry filler inserted.
Battery life is not bad on the 510 if you have a place to keep one on charge at work or in the car. There are some battery chargers out now that use a USB cable with adapters for car charging and AC. You just plug the USB end into the correct charger and you're set. Personally, I like the Ego batteries if I leave the house. They are pretty much good for the day. I just carry a small bottle of juice and top off from time to time.
You can buy Ego batteries and use them with your 510 atty and carts. The kicker is that an Ego battery takes 6 or more hours to charge on a 510 charger. That's not so bad considering that it will be charged before you need to swap. The Ego battery charger charges them in an hour to an hour and a half. You also would want the cones to sleek up the appearance. By the time you buy the batteries, charger, and cones, you can get the whole Ego kit for a few bucks more. I priced it all out and decided to get the kit. In addition to the batteries, charger, and cones, I got 2 more attys, 5 pre-filled carts, and a carrying case, which was well worth the difference.