I have watched a couple of videos taking about whether you should use motion or analog, whereas some just think that motion control is the best.
Video from Nintendolife's video despite being positive, the dislikes were still plenty...
I aware that when it comes to controls it's really personal preference... and with more options in Splatoon 2, it's really up to you.
I tried analog control with grip, and even though I think I can get used to after hours of playing, the small analog stick on the Joy cons just makes the movement hard to control. With motion on on the other hand works pretty good for me, I remember I have had mention this a while ago after playing Splatfest. So to some extent I kind of disagree with Wulf Denn, grip is still a way to go, at least for me and for now.
I haven't tried with Joy con only, I may try it out when playing story mode and see how it goes.
I will buy the Pro controller sometime in August, and definitely will buy the Splatoon 2 version. I saw one back in my game store, and in almost every store I went to the Pro Controllers were always there.