18x9.5 instead of 19x9.5 wheels for better tire selections?

Originally I was planning on 19x9.5 all around but there is fewer tire selections on the 19x9.5 compare 18x.9.5, the 18's 255/265 width is more common than the 19's 255/265 width..
Is there a significant concavity depth differences between 18x9.5 and 19x9.5 aftermarket wheels in the 30ish offset and which rim size will look better on the 4G TL?
Any member running 18x9.5 please comment and please let me know what size of tires u are running on

Thanks