Bjj . Wing Chun is difficult to master but once you master it well you will be able to strike or trap very well & from there you can finish it standing up for if you feel the opponent still packs a fight and think hes capable of landing you a mean punch to the head or something, then simply take him to the ground and end it there.Both of these arts in my opinion are quite similar and by taking both of these arts you will compliment wing chun and bjj quite well and apply BJJ tactics standing up, and also wing chun tactics like trapping striking on the ground with your BJJ . Judo just isnt ground enough since you already are currently in training in Ving Tsun so you shouldnt have to worry much about for stand up defense.