Re: The difference
I still haven't found a decent replacement for Impression Publisher on Linux.
Or !Draw for that matter.
Of course, were I running Windows I would be looking at Ovation which also started life on RiscOS. As for Draw, apart from the price, Xara Designer Pro X is absolutely stunning and I use it a lot at work. Version "X" has gained a lot of WP/DTP-like features. Xara began life as Artworks on RiscOS from Computer Concepts - the people that wrote Impression - and the company (after a flirtation with Corel and a buy-out from Magix) is still working from Gaddesden Place.
And the thing still reads Draw files, though not always perfectly :-/
Unfortunately the native Linux version of Xara is no more (AFAICT). I am toying with the idea of trying to run it under WINE, an experiment I might attempt at work, but I'm not going to shell out for it at home unless I can prove it works near perfectly.