I don't think one is any more easier to install than the other. There's a number of different vendors making SFC's for these cars. Some are tubular, some are square. Some are shorter than others. Everyone has opinions on which design is the best.
IMHO the two (or three) best are the Max Motorsports, Team Z and Stifflers setup.
Team Z thru the floor would probably be the best, but it's a more involved install and more invasive into the interior.