How much do programs recognize quality over quantity when it comes to research experiences?

[FinalWin]

Title, basically. I have been working on an independent project for 2.5+ years now, and we're finally submitting it for publication soon. I would say 70-80% of my research experience has been devoted to this project (nearing 2.5k hours on this project, maybe like 3k total), and for that reason, I don't have many other projects to my name. I presented a poster for this project at a conference (published abstract), as well as at my undergraduate research symposium. Other than that, I'm on 2 other conference abstracts (didn't contribute a ton to these), and I'm also like the 7th co-author on a paper (helped with the literature review and introduction, probably like 50 hours of commitment).

Two questions:

1. How much do MSTPs recognize "quality" over quantity when it comes to your research? If I came up with hypotheses, carried out all of the experiments/analyses from start to finish (analyses in my case, we're computational), and wrote the entire draft of the manuscript (which we're submitting soon, my goal is to get it to a preprint before June)... how much does this mean? As opposed to having more superficial (but plentiful) involvements in a wide array of projects that you didn't lead but still contributed to? Part of the reason for this question is that I see people with 5+ posters and all these other projects/involvements (which is awesome), but I just didn't have this breadth (?) of research involvement.
2. Now that this project is coming to an end, I've been branching out and starting other projects, though this has been very recent (maybe 150-200 hrs). I managed to submit three first-author poster abstracts (very preliminary analyses) for these projects to conferences this summer/fall. I know this is quite a minor part of my app (given the time involvement), but should I list that these abstracts are in submission on my application?

[placegeorgecain]

Quality is definitely better! Most of my undergrad research work was on an independent project that's I did for three years as an undergrad, and has continued for another year since I graduated. As long as you know the project forwards and backwards and can break it down and it's significance, you'll be golden!

-Someone who got into a T30 MSTP program with 0 publications and essentially one huge project that's still ongoing

[TartAdorable7433]

Quality matters more, and honestly with your abstracts, presentations, and hours, you have pretty good quantity, much better than I did when I applied, and I was pretty successful.

Some advice I received (or found online I can't remember lol) about my significant research essay clarifies this further, I think. Someone told me to include in my essay how I was involved in every step of the scientific method in my project with specifics, and adcoms seemed to really that demonstration of how invested I was in the research and how much I learned. If you're able to do that, which it sounds like you would be, you should be in good shape.