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It's probably only a subtle difference. I do use easifill for joints in plasterboard. It is a lot easier to feather with a sponge.
I use a mix of powder or ready mixed fillers but the ready mixed is normally for tiny quantities when you need to fix very small areas. It's worth measuring the weight of filler by a small quantity, say a plastic cup and then measuring the amount of water the manufacturer recommends to mix with that. Then you have 2 measurements you can replicate on site and your mixes will improve.
Airhead-
The plastic cup idea is a good one, thanks. I am forever mixing far too much also.
Another tip for DIY-ers who can't be arsed to rake out and fill hairline cracks is Polycell "Crack-free Ceilings" crack filling paint. I've done a few now in areas where the room has been decorated and I really couldn't be bothered with the mess/hassle of properly filling. One was a loooong but tiny hairline crack in the ceiling of mini_com's room. It got filled once, but came back. Left it a few seasons to see if it would get any worse and to know if I needed to panic. Stayed the same. Painted with this stuff and the crack has yet to come back. Despite the room above being in more constant use now. It says it is a matt finish, but definitely dries with a more satin result. So even brilliant white on brilliant white, you need to go over it with your ceiling/wall colour.
stevo_com
You obviously have more experience than me, although I have filled MANY cracks in this bastard house, I've not had a problem with it being too soft to sand. Although, that being said, I have not used Toupret interior but I've not thought easifill was lacking in that regard. I have found that the ready mix dries harder or at least more consistently than when I try to mix it. And that is absolutely because I am an idiot and winging it in terms of getting the right consistency. It just depends how much I'm doing at any one time on whether I go ready mixed or bagged for cost effectiveness reasons.