lets assume when you say "couple weeks" you mean 4 weeks.
in the past 4 weeks ETH price has gone down from 0.078BTC to 0.053BTC and that is a -32% drop!
in other words "just holding" you are losing money.
meanwhile bitcoin has gone up from $3680 to $5700 in the same 4 weeks. and that is 54% rise.
in other words if you kept your money in bitcoin you would have earned profit!