18" or 19" Wheels

So I have a set of aftermarket 19s on my G8 GT at the moment. I also picked up a set of OE 18s recently. I don't really like what's on it right now. So I have someone wanting to buy them. I was going to go back to another set of 19s. But as I get deeper and deeper in this car. The 18s are definitely a bit cheaper. I guess my question is. Should I stick with 19s or be ok with a set of 18s. I'm scouring the internet for a nice set. I'm sure at the end of the day. It's probably just preference. Thanks in advance for any input.