I only use the hacksaw blade with a pull stroke when I'm cutting curves with and without the frame, because its easier.
On regular work I haven't found it matters much, above all, Bahco blades are good'uns and more forgiving if you're an animal with them.
I'd like to know why one would have a reason to have it a certain way
for some operation.
Not even this craic of double kerfed curve cutting, will make a blade toast toast as quickly, as not using a good vice.
I have been making do with a few ball vices, it's very annoying to damage a new Bahco blade.
If Lidl UK stocks them around the same, I think it may be August or maybe before it in your case, before those wee solid Parkside bench vices come in, probably 20 pounds.
I'm holding out for it, as it's pretty compact.
I have one at the folks and I've really abused it, still going alright, sound for the tasks I need.
Tom