4G63T has more performance parts than 4G93T since the 4G63T is used by iconic performance cars like Galant VR-4 and Lancer Evolution. However, most of the old 4G63T are quite old already some might be over or nearing 20 years old compared to the newer 4G93T so you expect spare parts for 4G63T can me more scarce. For 4G63T, there are many different ones taken from different cars like VR4, Evo 1,2,3 or RVR. Which one are you eyeing? VR4's 4G63T block is very reliable from what I've heard from many.
At the end, if you ask me, I think it is probably better for you to get a 4G93T as the engine is newer and easier to maintain than 4G63T. As this is a Proton car, a lot of people have said that it's chassis can't withstand too much power or you'll risk cracking the chassis which is dangerous. So I think 4G93T should be enough with around 200hp at stock form. I don't think the car can handle it if you get a 4G63T and modify it too much. Unless you are planning to remain the 4G63T in stock form, then I think you should got for the 4G93T.