Out of every type of girl in an anime why pick those types. Imagine liking the girl that does nothing but talk trash about you and bully you. Like this is just an unrealistic type to like you will never be able to have a serious conversation with these people. That's why I only date the realistic Yandere type girls
Yandare characters are basically insane when it comes to someone they happen to like, that obsession could lead to possible deaths including your own in some cases?
I get what you are saying Tsundere characters are kind of rude and can get annoying, but possible having a crush on a character or someone who could possible kill you or anyone else you like is scary, so I would have to say both are annoying in some cases.
I wouldn't say Yandere girls are 'realistic' sure there are some girls out there who are like 'oMg Im So DepREsSed And INsanE i'M sO QUirky!'
Would you really have a crush on one of those types of people, or rather someone who has a hard time saying what they think, who are more realistic in a sense when it comes to anime characters instead of a attention seeking thot.
Tsunderes are more realistic.
The thing with Tsunderes is that it is difficult for others to become close to them. If a MC can get close to a tsundere, it means that the tsundere genuinely likes the MC. It also means that the MC is way more powerful/awesome than the MC would have been if the tsundere was not a tsundere to begin with (so the tsunderes make the MC look good).
Tsundere can easily be boring, but if done right they can be very entertaining.