I've played a game of HexSymple now and it offers slightly different tactics, tightly interwoven with an obviously deep but somewhat less clear strategy.
A square grid offers more strategical grip and in my experience makes 'visual thinking' easier, at least where territory games are concerned. In connection games it may be different and for me the connectivity issues in HexSymple were less of a problem indeed than staking out territory.
Interested players can try HexSygo in the mindsports player section, have fun
