The Strider Essential is actually 80+ certified, is made by Sirtec (ok mfr but hit and miss quality), is more of a 'value' oriented PSU, has a 1 year warranty, and has 46A available on the 12V rails. The Seasonic is made by Seasonic (top-tier mfr and quality), is 80+ Bronze, has a 5 year warranty, and 53A on the 12V rails. Seasonic is a better PSU by a far margin.
Yes the Seasonic is easily the better PSU as Rugger has said it has a better +12v rail which is important. The build quality is better and the warranty is also much better.
Its also worth noting that other top tier PSU manufacturers such as Antec and Corsair sell a lot of what are basically re badged Seasonic PSU's.