I find it easier to get a good disguise with the feet wide apart during the serve platform (similar to Federer). With the pin point you'll find it easier to move your body into the court (creating pace and spin). The first technique is more taxing on the abdominals though I'd say.
Wilson Pro Staff 6.0 85 (TW Reissue) Babolat Tonic+/Head SPE 16 @ 22.5/20.5 kg
Wilson Pro Staff 90 (2014) Babolat Tonic+/Head Hawk 17 @ 22.5/20.5 kg