Is Electrum considered as a something safe ? And waht about MultiBit HD ? If not, if I put it on Bitcoin Core, will it be safe ? I think so, but maybe that with all their mess...
in the case of "storm" and planning on putting away your coins till it passes there is no difference between Electrum, Multibit, or Core.
if you want to spend it during, then it would be a different story. because you need to know your (Electrum) server that you connect to uses what chain!