I've used both. Get the dry ferts and a water bottle with a squirt top. Measure the ferts out, dump them in the bottle, add water and shake. Then every day, measure out a fixed amount from the bottle with a measuring spoon and dump it in the tank.
All the dry ferts I need cost about as much as one bottle of Seachem's stuff, and now I dose out of one bottle instead of several. It's surprisingly difficult to follow the directions on a Seachem bottle for a 10g tank, too: the solutions are so concentrated that they give dosing for larger tanks. When you're making the solution, you can choose how concentrated it is, and make it once every month or two.
The forums can help you with how much dry fert to add to x amount of water, etc, and help you figure out dosing. It's pretty easy to do with measuring spoons. (I could post what I'm using, but I haven't been doing it for long enough to know if it's right).