The canems is ok price wise and that will do doubt sell them to clio owners as they seem to be very cost driven rather than quality driven, and they are quite good news for the resellers too as the margins are quite good IIRC (think of it as the ecu equivalent of a set of spax, lol) so they make as much as on a dearer ecu still, retail was just under 450 I think a guy I mapped one for fairly recently said he paid IIRC, its a bit crude in places, especially the transient fuel control, I'd take an omex personally TBH but for an application like yours toastfrenzy it will be fine, a racecar on ITBs is a very simple application so just about any ECU will do that absolutely fine, hell you could even use emerald at a push, yuck, lol.
Gen90 I believe there are two levels of software, one that gives you access to more of the ecu than the other. They are priced over the odds for what they are really but then they are easier to install so that sort of makes up for it if you are paying labour for someone to do that for you as there will be less labour involved with it being almost plug and play.
I'd personally stick to Omex or adaptronic if on a budget not because the ecu is specifically better than the other cheap options but because they are very reliable and very well supported in terms of places to map them, the last thing you want with an ECU is to end up tied down to just a handful of mappers to choose from or to have a problem and not be able to get it fixed or replaced.