Pistol or No Pistol

With the new rules for large close combat weapons and the inclusion of a pistol in all marines gear the question has arisen, should I keep that bolt pistol with the powerfist or trade it in. For a unit like Sternguard, this is easy since their bolters are special, but what about your normal sergeant. Bolters help the units firepower but the pistol still allows you to shoot and charge. What