V2 does software based motor power levels. V2 does not need additional cooling on stepper drivers. V2 has a safety circuit which could be used with thermo switches (currently unused in any of our printers) V2 is 24V instead of 19V. V2 uses PT100s instead of thermocouples.
(Sinon on peut aussi te répondre en français dans la section francophone )
The 1.5 electronics can't drive directly an heated bed, you need additional hardware (Relay, ...) -- It is not a big issue per say, but if you don't have any board, then it is easier to go with the v2 board which has 'everything'.
Other than that the V2 board is all-in-one and does not need separate Arduino, stepper drivers, ...
Also it does not need active cooling.
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