Charades do tend to have a little less availability of parts. However, if you know where to look, you CAN find parts for it in good nick. They would of course be expensive because of the availability factor. If you are a person for whom others' opinions matter a lot when it comes to cars, I'd suggest you to go with a Suzuki because the people around you would say things like 'yeh kyun le li hai, isko to yeh hota hai to isko woh hota hai' and you'll start losing interest in the car. Personally, a lot of factors make the Charade much superior to other Suzuki cars available in the range for me, hence I'd prefer it over almost any Suzuki car in the price bracket, in fact, in the bracket above as well.
That said, if you want an easier way out and depend solely on the mechanics/ustaads, go for a Suzuki as the ustaads are somewhat seasoned to work on Suzukis.