I don't know of any template but there is lots about this if you google. I can tell you a few things from my experience with a 13", there are some things you may not think of.
Before I did my music degree I had a 17" but after the 1st year the GPU died. As I was in the middle of a degree I didn't have time to research the problem so I got a 13" to get me by so these are the pros and cons I discovered. Incidentally, on my 13" somehow the LVDS cable managed to detach from the display and had to be reattached which involved taking the screen off, I'm not sure that this is a common problem though. 13" is not going to be so much fun for gaming because of CPU and small screen. Movies aren't so great on a 13". After I finished my degree I bought a 17" with a defective gpu cheap and disabled the discrete gpu, this one has the 2.5Ghz CPU its a BTO version. Its really fast and I'm loving have the big screen again, its like a relief to not have to fight for screen space anymore. I recently found a company called ALB repairs that will replace gpus so I might have that done, my only reservation would be what they are replacing it with, where they get the replacement gpu from. If I decide to go ahead I will ask them about that, the cost is £170-190 but this would be a luxury as I don't really need the discrete gpu as I can still use my 13" with the TV if I want.
Cons:
On older ones 13" tends to have i5/i7 dual core rather than i7 quad core, weaker processor - very noticeable for me, I had to bounce tracks more frequently when working in Logic Pro x to reduce plugin load. Newer ones will have inferior processors to 15" machines.
Some apps wouldn't go into split screen display because there wasn't space, Adobe digital editions for example so if I wanted to take notes on a book using pages I had to carefully shift the windows and adjust zoom so I could see both. Guitar pro also wouldn't go into split screen. There were a few apps that wouldn't go into split screen. Working on a big project with lots of tracks is a pain as was working with midi and zooming in to get more accuracy for adjusting automations, you can't really work practically with the tracks view and mixer/edit views at the same time. Working on graphics/Publisher I had to zoom in much more for accuracy. I found myself using the multiple desktop functionality more so rather than using split screen (I still use these more since going back to 17" its a really handy feature so I learned something from using a 13" for a while).
You can't get a 13" with an antiglare display, antiglare displays are much better in my opinion. It's easier on the eyes.
I usually use headphones but the sound from the speakers on a 13" is inferior to 17".
There is no microphone socket on 2011/2012.
13" doesn't have separate arrow keys on the keyboard, which are good for navigating documents and might be of interest to gamers.
Camera angle is not quite as good (probably a negligible issue).
Pros:
They are very small and light for carrying around and less likely to get knocked.
Probably more manageable if you want to take it out in a coffee shop.
More a proper 'lap'top than a desktop with a folding display. Although you probably still don't want them directly on your legs because of the heat.
You can hold them comfortably in one hand.
They take up less space in a bag, you can have a smaller bag.
The whole screen in your main field of vision where as the edges of a 17" are in your peripheral vision. You don't have to move your eyes around the screen.
They require less space on a desk, say if you want to put it down on someones desk next to their laptop so you can show them something.
They don't have discrete GPU so are probably more reliable.
Batteries are cheaper, chargers are cheaper and easier to find but then you don't need to buy a lot of these.
Hinges probably last longer but the relevance of this has more to do with how you treat the computer.
Probably last longer on battery.
Cheaper.
I think this is why 15" was always popular, because its a good compromise between the two.
Probably has a lot to do with what you use it for.