I'm struggling to make much sense of your question, as I can't think of anywhere that you could be starting from that offers nearby routes into both Waterloo or Paddington. (I thought that you're in the Portsmouth area, which would offer you plenty of South Western trains into Waterloo, plus a smaller number of Southern services into Victoria. I'm unaware of any routes into Paddington from that part of the world).
Peak time restrictions do vary greatly between different routes though, so I'm not unsurprised that there might be some differences. (They usually only cut in from around 1630 onwards but there might be some variations).
If you tell me which stations are accessible from where you live, together with a rough indication of the times that you want to travel at, I'll try to provide you with your best travel options.