This is a tricky one, because they’re both awesome flavours. But clearly a coffee flavoured RTD has to be the way to go and I feel like enough time has passed for some pressure to be applied to Huel HQ lol.
while coffee would be popular - commercially speaking it would have to be banana - which is a far more popular flavour in the retail flavoured milk sector. (actually - a Black version would be even better - high protein flavoured milk drinks are the biggest growth sector for adult consumers at the moment)