The right PPM will help you analyze and choose the right projects. What technologies is your company equipped to handle this next quarter? What are your revenue goals and do the current projects in the pipeline matchup with those two and other criteria you've setup to help determine what projects to start next or even chase next? Your PPM should be able to help you with those decisions.
Knowing your resource requirements and allocations is a key to proper project staffing. The right PPM knows how extended your resource pool is and what skill sets are available. If that next project isn't a match for the organization then the PPM will flag it as a concern and show you why it's not a match. If you can't take it on with the resource availability you have right now, then you won't and that means saving you from an embarrassing customer situation. I've been there – I've helped organizations figure out which projects they can take on and which ones they should set aside for now even though the CEO has made promises. It's hard – but the PPM or Hybrid PPM / project portfolio management tool makes it easier.