If they're from the same litter you really should take both. :) Two kitties is not too many for one person. Quite the opposite. They'll take care of and look after one another. The family bond does not die.
Quick story. Many kitties get eye issues. At least one eye runs so much that they can get skin irritation on their face. But this is rarely a problem when family members are adopted together, because another kitty will groom the area as needed until it heals. :)
They are both so adorable though! It is hard to choose 😖 However, if I must, I am choosing blondie. I feel like it will retain more of its cuteness as it gets older than compared to the greyish one. It also has slightly more adorable fur (but that could be because I think cats with that color look cool). In any case, I'm choosing the blondie.
I am really not an animal person, but when I saw the pic, I instantly melted at both of them. What a tough decision upon you, girl. I think I like the little gray one just a bit more. The look on his face makes it seem like he wants some love but is too shy to ask :( :( so cute! Blondie looks like he/she is a pro at making cute faces and will get an owner in no time. Go with gray!
You should get both. You say that it would be too much but I highly doubt that. Cats are very low-maintenance and independent, it wouldn't be like having to train two puppies for example. Plus, I'm sure that they'd like the company of one another.