a little more/ a little bit difference

[marex12]

1. I can't really afford those jeans even though they're only a little bit/little more expensive than the others
Little bit is marked as correct

Zad 4
1 My new smart phone is only a little more/a little bit sophisticated than the old one.

little more marked as correct

what's the difference?

thanks in advance

 

[Englishmypassion]

Use "... a little/bit more sophisticated than...". You need "more" before sophisticated and use either "a little" or "a bit", not both-- "a bit" is a little more informal than "a little".