Welcome gab_gab, Depending on a JW's personal circumstances dating a non-JW could cause JW relatives and friends to mark a JW and consider that a JW is a poor association and possibly to withdrawal financial support. I also would not recommend that a JW date a non-JW if they plan on remaining a JW. IMHO non-JWs are not aware of the severe social consequences of dating a JW and most JWs are incapable of being honest with themselves much less to non-JWs about the WTBTS - the WTBTS is a dangerous cult.
I can think of a very major reason not to date JW women versus non-JW women. JW women are more likely to have more emotional issues that can put a strain on a social relationship. To be a JW, a JW must have unswerving loyality to the WTBTS and conditional love for family and friends as long as one believes that the WTBTS has the "Truth".
How can a relationship be formed with an authentic persona when the cult persona is making a mess of things? Dating a JW is the ultimate ménage à trois nightmare for two lovers.
Peace be with you and everyone, who you love,
Robert