After some googling, I found this grammar to be LL(1) but not LALR
S -> (X | E] | F)
X -> E) | F]
E -> A
F -> A
A -> ε
LALR fails because there is reduce reduce conflicts in E and F productions.
With LL(1), decision is made based on the FIRST set of alternatives where ')' and ']' falls in different set of alternatives.