I can't make up my mind with either games but I think the under 149.5 looks good. If you look at past years generally championship game is low scoring more often and the under hits.
Total bettors have watched the ‘under’ go 17-13 since 1985 and is 5-1 the last six years. The highest total ever in a championship game was 163 ½ while the lowest number was 112.