I wouldn't say Adobe is necessarily better than Corel, but Adobe is more widely used in graphics industry as a whole. But I think Corel might be more widely used in the screen printing/garment decorating industry.
I use Adobe software 99% of the time with Corel the only other software I will use. But I know Adobe software extremely well since I have been using it for almost 20 years. If you know Corel, I see no reason to move away from it; I have seen tons of amazing artwork done in it. I like to have the latest versions of what I use, and getting X5 is not going to hurt, it can only have better features.
Don't bother with the free stuff since you already have Corel.
I use Adobe software 99% of the time with Corel the only other software I will use. But I know Adobe software extremely well since I have been using it for almost 20 years. If you know Corel, I see no reason to move away from it; I have seen tons of amazing artwork done in it. I like to have the latest versions of what I use, and getting X5 is not going to hurt, it can only have better features.
Don't bother with the free stuff since you already have Corel.