This is the fourth time this matter has been discussed this season alone and even with the current posters acknowledging the fact that SALEM has obviously represented Class 4 well it keeps coming up. Most of if not all of the crowing came from Phoebus (not class 4) and former posters.
For the sake of discussion I will oblige you Southbottom.  Since realignment 3 teams (welcome to the party Louisa) have represented the "east".  Two teams (Sherando and Salem) have represented the West. Currently the West has two titles and the East two. 
Counting the regular season and comparing the state finalist  Salem is 2-2, Sherando is 1-2, Lake Taylor is 1-1, Dinwiddie is 2-1 and Louisa is 1-1 against the old west finalist. West 3-4, East 4-3 not a bit of difference. 2 titles each.
Personally, I dont see where the "West" has really shown a damn thing except no one in the old west can beat Salem.  I didnt start following preps until the end of of the 2013 season, but I surely remember people acknowledging Salem being able to compete anywhere in the state and they have proven it.  I am not saying there are not other good teams in the old west, so do not read into things.  Class 4 is probably the most contested division in Virginia and there are sounds teams throughout. 
In closing, I do want to give Louisa its props.  They ran a through a gauntlet in the region and semis.  Go Lions and go Region B! See guys there is no East and West, just regions.  Maybe the VHSL can help us answer this question by swapping the semis one day.  If you c and d guys want to see this tell your ad's.  The a and b teams want it.