Between the two, I would get their combo plane personally. I won a plow plane in a raffle and I’ve used it a fair amount, but wish I could do more with it. I can’t really justify having that and the combo, so I’m sticking with it for now. Maybe some day I’ll sell it and just get the combo personally too
I’ve honestly never had a problem with grain direction, but I’ve also had pretty good luck being able to select good boards to avoid wonky grain when I need to use the plow. Having both handed versions would certainly be a luxury, but I definitely don’t think it is necessary, personally