toronto, I am a proponent of "phonolinepreamps" when they are designed and built to a high standard, as is likely the case with Accuphase. From an audiophile point of view, they offer phono function without the extra chassis, which eliminates output and input jacks (RCA or XLR) and the interconnecting wires. (Also saves money, often.) They also permit a very short path between the output of the phono and the linestage, which has additional benefits regarding impedance matching. However, it is fair to point out that a built-in phono may provide fewer options for variable capacitance or resistive loading, as Elliott is pointing out. So in one sense it would depend upon how the offered features fulfill or don’t fulfill your needs as regards your choice of cartridge and any future plans you may have as regards cartridges.
On the other hand, if the phono module works fine for your particular LOMC cartridge (for example), you can always add an outboard phono in the case where you want to add a high output MM or MI type cartridge and plug it in to an AUX input.