Ok... Archbishop is a good school, if you like / can bear churchy things, Tregolls has a reputation for being very good with SEN / additional needs and has a high proportion of children from these groups - parents seek out places there if their children need extra help. The housing nearby is okay, but the Trelander Estate bordering it has a high (for Cornwall) crime rate and there don't seem to be many shops built to support the new housing. You'll also be in the Penair catchment for secondary, and they've had some problems lately.
Pen An Dre - good development but traffic through the area is in a bottleneck and getting worse, especially as they are about to build thousands of new houses at Threemilestone. Truro Learning Academy is walking distance - had an awful reputation but recently converted to Academy status and is getting better - though local parents are still wary. Threemilestone is also a good school, but like Archbishop Benson and Bosvigo (also good), you'll have to fight to get a place as Truro schools are becoming oversubscribed. What age are your dc(s)? You'll be in Richard Lander secondary catchment here, by the way.
Perranporth and Goonhavern - good schools, don't know as much about them. However, personally I wouldn't be fond of Perranporth in the summer as it gets quite over-run with tourists. It's a bit of a cheap holiday mecca and there can be summer crime. You'll have a park and coffee shops there, though.
In summary - of the Truro schools, Bosvigo, Archbishop and TMS are best, but make sure there are places for your dc(s)!