need a little help on building my rear

yeah my engine is probably more then i need to have in that car but its gonna be more of a local car and track car i know im going with 4.10 gears im just not to sure what will work best in type of differential my options are spool 35 spline, trac loc posi 35 spline , true trac 35 spline detriot locker 35 spline , and spool 40 spline