Ok, so good to see we agree that the Lib Dem approach to stopping Brexit is essentially the same as Labour's.In any referendum, the Lib Dems would campaign for remain. Labour would campaign for its own Brexit (details currently unknown). These are stated positions. Tell me again why remainers should support labour over the Lib Dem’s?
I never claimed Remainers should support Labour over the Lib Dems. If you are a voter who sees membership of the EU and stopping Brexit as taking precedence over everything else, then you have good reason to consider voting Lib Dem over Labour.
Edit - also Labour's policy on whether it would campaign for Remain or its own deal should it gain power has not actually been stated, as far as I'm aware. The last I read was that if they found themselves in that scenario then it would be debated internally before an agreed position was reached.