1) I believe the Presbyterian form of ecclesiology to be the biblical one, and hence associate myself with Presbyterian churches rather than continental Reformed.
2) I believe the Westminster Standards have a greater precision and systematic order than the Three Forms of Unity, and while the latter are often (rightly) regarded as being more experimental than the former in many parts, I believe the systematic precision is the far preferable factor to emphasize as necessary in a confession of faith, because of the very nature and purpose of such a document.
The two elements of systematic precision and experimental content or presentation are both imperative for the Christian's edification and spiritual nourishment, to be sure - but the primary biblical means of that personal edification and nourishment for believers is not their reading of the confessions, but rather the preaching of the Word by the ministers of their church; and in preaching as such, the two aforementioned elements are both imperative.
The confessional documents, however, have a fundamentally different purpose than preaching, which is to define the doctrinal beliefs which the Church affirms and upholds. And in that purpose, it is not imperative that the documents have a particularly experimental nature, whereas it is of utmost importance that they have a very precise and systematic outlaying and statement on the exact beliefs of the confessing church.
3) Fortunately, another reason I am able to consistently hold primarily to the Westminster Standards is because I have been providencially placed in areas and situations in which confessional Presbyterian churches are accessible, whereas such has not been the case with continental Reformed churches. That is not to say, by any means, that my ultimate commitment has been determined by this factor, and in fact I would put forth a great effort to find and get to a continental Reformed church if I believed the Three Forms of Unity to be superior to the Westminster Standards and presbyterial ecclesiology. Since that is not the case, howeve, I am simply mentioning this as a providencial occurence that has allowed me to both adhere supremely to the Westminster Standards in my personal conviction and fellowship and serve in a church that confesses the same.