Before using Guru or one of the other seat map sites, you need to find out which a/c is operating this route. It might be the A343 or the 346 and that makes a difference. The VS website used to list the EQU but (when I last looked) no longer do as it gives them operational flexibility but the seat allocation map in the booking engine should state clearly which one it is. Otherwise, compare cabin sizes with one of the seat map sites.
Lastly, consider the length of the two sectors and whether you are a sleep-all-I-can, or up-and-about kind of pax.