Both the colleges are good but I would keep VIT specially the main campus first then will consider SVNIT.

You can consider below links to know all about SVNIT & VIT -

http://www.engineering.careers360.com/colleges/sardar-vallabhbhai-national-institute-of-technology-surat

http://www.engineering.careers360.com/colleges/vit-university-vellore


Note : It is advisable to choose the college as per your interest and convenience, if both the options are available for you.

Good Luck!!!