Please provide some info to the 2 kits you are comparing. It's a bit of a minefield.
Hasegawa Kongo kits are old, 90's old. There was an old Fujimi kit that's even older but it's rather rare nowadays. If you are searching kits by price, it could be that you stumbled upon 2 old tools, it's unfortunately scraping at the bottom of an ancient barrel and neither are any good compared to current stardards.
Fujimi has since produced 2 versions of Hieis after 2000, one normal and one 'snap together' style newer tool.
Go with new Fujimi versions if you care about a kit that is modern standard. But modern ship kits are by definition fiddly with many parts. If you want something that sort of looks like a Hiei, Hasegawa might just do.
Refer to scalemates for the history of
Fujimi Hiei
https://www.scalemates.com/kits/fujimi-46007-japanese-navy-battleship-hiei--1023799
and Hasegawa Hiei
https://www.scalemates.com/kits/hasegawa-43110-ijn-hiei--264634
Check the box arts of the kits you are comparing against for indications of their vintage.