Yui should win this. She has all the waifu qualities one could ask for. It's weird seeing people vote against her. This is in no way a denunciation of Winry, but rather a call on you guys to support the character who just happens to be more charming. Granted, personally I would choose a more aggressive approach here, but out of respect for my beloved Yui, I will behave well because that's exactly what Yui would want me to do. Yui isn't someone who approves a mud fight after all. This is also one of her special traits. It doesn't require Yui a beating with a wrench to knock some sense into somebody. All she needs is her adorable personality.
Such a beauty appearance and personality wise, isn't she? She isn't a tsundere who needs +500 chapters or +25 epsiodes to befriend with the seemingly strange MC. It's in her nature to get along with anyone who is in close proximity. No prejudice, no hypocrisy.
She always tries her best to not anger or offend someone, even if it means sadness for herself, which she will cover with a cute smile. Now, you might think "is this really a good trait?". I agree, it is debatable.
But that's exactly why I brought it up here!
Everyone in this event only talks about his waifu as if they were perfect, without any flaw. Something like this doesn't exist! Yui will break this rule! And I won't allow Yui to be seen like the rest of the nominations. Such boredom! Yui is different, in a good way, and that's why she stands above anyone else. Yui's flaws aren't inhuman, doesn't hurt anyone other than herself. It's something you will work on in a relationship with her. That's one of the corner stones of a beautiful relationship!
Thank you very much for your attention.