I definitely agree with Joanne here, if you want to just try to find the thing that'll be the most quickly successful, you definitely can just put a couple of cute anime boys in a cute situation and make them kiss -- but I think if your heart's not in it, the webcomic won't be fun for you, and that'll show in the work.
Webcomics are very much "a marathon, not a sprint." In most cases, it takes at least a year or two of updates to really get an audience. So the trick often isn't to find The Most Popular Style, but to find the thing that you love so much that you're able to stay motivated and excited even when it doesn't take off right away.
Your art is really lovely! Though I do also notice all three examples are of the "character floating in a void and looking at the camera" variety -- and in comics, being able to draw environments, and being able to compose an image that clearly tells a story are gonna be a lot more important than what style you use. Can you draw characters interacting? Can you convincingly capture different expressions?
I do also agree with the folks who've said that the art style you use needs to be one that you're comfortable with and will enjoy working in. Webcomics are A LOT of work, you gotta at least enjoy it enough to want to do it over and over and over again!
I mean, if you have great art, but terrible writing, you'll probably have more people clicking on and subbing to your comic than if you have great writing with terrible art, just because art is easier to see up-front. But I think if the art doesn't serve the story well, or if the writing is lacking, it's going to be harder for folks to be really engaged and invested -- they might keep reading anyway, especially on tapas where it's easy to just sort of flip through all your recently updated comics and look at the pretty pictures -- but you're not going to see the same excitement you'd see if they were dying to know what happens next to characters they care about.
So my feelings are, I think it would be hard to say which people value more, but both elements definitely factor into audience engagement in different ways.
Hmm! My experience with creating a webcomic is that, especially for your first webcomic, you'll learn a LOT just from doing it, and you'll start realising "things you should've done" really quickly, and so you really have to be able to accept making something that's imperfect, but to be really proud of and excited about what you've created anyway.
The hardest thing for me was and is being realistic and honest about when I need to push myself to get it done, versus when I need to step back and take a break.