I've been using Frog Tape for about 10 years with no problems. In fact, I've just finished decorating our bedroom using it for the skirting board and ceiling edges.
I use a decent brush and a steady hand. Purdy XL Elite angular trim brush to be precise.
I'm really struggling to see why anyone would use masking tape for doing a skirting board edge it's so easy freehand and takes half the time!
I have been putting off doing some skirting boards as we had engineered oak fitted and new skirting over - would frog tape or the blue 3m be good for putting on the flooring?