Ultimate Guard magnetic card cases: do you recommend 35pts or 55pts for Pokemon Cards and with the use of KMC fit sleeves?

Hi there,

Basically the title. Note that my question is specifically about the Ultimate Guard brand.

I will display a few cards into those magnetic cases, the cards will be placed into KMC inner fit sleeves and I have read mixed information here and there : some say that the card+ sleeve will fit perfectly in a Ultimate Guard 35pts, while some recommend going a bit more loose by choosing the 55pts because the 35pts may bend the card.

I am not sure why there would be no issue with inner-sleeve + Ultimate Pro One Touch 35pts but would not work with Ultimate Guard Card Case 35pts.