You may want to post your question on RV.net and iRV2.com also.
A pop up May be tight for all of you. We are a family of four and started with a fairly large pop up 12 years ago when our kids were little. We loved camping in it but were constantly tripping over each other. On the positive side, it fit nicely in our garage, and pop ups are lighter to tow (better gas mileage). Pop ups also seem to hold their value more than many other types of RVs.
We looked at hybrids when we were getting ready to trade up. Definitely more room, but ultimately we went with a fifthwheel. There are quite a few RV parks that won't allow pop ups. Many of them also won't allow hybrids. As long as we were going with hard sides, we decided a fifthwheel had more room and more stability when towing, so that was what worked best for us.
If you're using the trailer only for sleeping a pop up May be the best bet but if you plan on spending any time in it definitely go for the hybrid.