Downloading manga is the best way to go for fidelity and enjoyment. I do like to test a manga by reading it online a few chapters first. Though I have been a manga/anime fan for a long time, most if it is shit. Character deaths, NTR, action, excessive drama; all done for the sake of story seem predictably contrived for me. I'm talking 40-60 chapters before hand accurate predictions. I didn't see an option to select "Buying Manga" as that is my favorite form of media. Becoming vested is simple, yet the depth of the art sticks to your retina. My book case full of manga is both a point of pride to friends and shame to strangers haha. Here's an example. I was rearranging my extensive collection and remembered when I had bought the final volume of Love Hina XX years ago, while I lived in XX doing XX for a living. Good times.
Manga on-line is easier to read. I can put half the Manga page in full screen. And the keyboard controls, to change the page and role up and down, are usually very good, and easy to use.
The Internet connection is not a issue.
But, any software that I use to see the .jpg, it simply show me all the page, making it very hard to read. Especially when the translated words are very small.
when reading online, you have to scroll down every time you turn the page, unless you zoom it all the way out.
i just find it easier to load it in CDisplay, and downloading manga only takes a matter of seconds.