Computer/Tablet/Smartphone/Phone.
I agree that a tablet or smartphone is great for consuming, but not for producing. Lack of a real keyboard is a big minus on tablet and smartphones with my fat fingers. But computer or netbook has power requirements and weight that puts it in a different category of useability.
I have toured with a netbook, a 7 Inch Tablet or a Smartphone.
Netbook (Lenovo S10, XP). I use this on trips where I will often or primarily be indoors at night where there is a power outlet. I have used it on a 300 mile bike tour where we frequently camped, but that was before I bought a tablet or smartphone so it was my only e-mail option at that time. Since then the netbook has not been on any bike trips where I carry it in panniers. It is my understanding that you have to be in USA to get a Google Voice account, that enables the netbook to be used as a VOIP speaker phone (I use a plug in headset with it) on wifi, I called to USA from Budapest with the netbook at no cost with Google Voice, but to call from USA to foreign countries has a low cost. I bought a battery that lasts over 8 hours, if I am flying I take the big battery for use on the plane. The big battery lasted from New York to Prague, which is a long flight. My next bike tour will be vehicle supported, bringing the Netbook for that trip. See photo. I use a Netbook as my home computer, but at home with a 20 inch monitor and full size keyboard and regular mouse plugged into it. I have three of these netbooks, one has a bad fan bearing so that one is dedicated to travel only. The 2nd gb of RAM was easily plugged in, only took a few minutes.
7 Inch Tablet (cheap Chinese generic brand, Android 4.0, no GPS chip). I bought this for a three week bike tour where I would have two train rides of over 24 hours each so that I could read a bunch of files that I had that I wanted to read. It is a great wifi device and I can read e-mails quite well, but for typing a message it is less than desirable. Big selling point is low power consumption and ability to charge with a USB circuit which I eventually will have for my dynohub. It also weighs less than the big battery for my Netbook, so very convenient for travel. The particular one I have can use a regular mouse, this is not a common feature however. At this time, it is permanently stored in my gym bag, I use it to read the news on an exercise bike at the health club where they have wifi, one of the bikes they have even has a USB charging port so I do not need to charge it at home. At one time I had it configured so that I could use it with Google Voice as a phone where I had a wifi connection, but holding a 7 inch tablet to the side of your head is pushing the size limit for convenience.
Smartphone (4.7 inch screen, cheap Chinese generic brand looks like a Galaxy S3 but lower quality components, Android 4.1, GPS chip, Dual SIM capability). On my last tour, this was my wifi device for e-mail, I do not use it as a phone, have not gotten a SIM card for it. I initially bought this to use as a GPS with downloadedmaps. But have also found that it can do almost everything that my tablet can do, just smaller screen so need better glasses. I also have configured this to use Google Voice so I can use it as a phone where I have wifi. The GPS apps that I use on it are MapsWithMe (free version) and Russian Military Maps where I use the Open Streets Cycling map layer (paid version, $11 USD). I also have some dedicated GPS devices, so the Smartphone is not used for heavy duty GPS tasks.
Cellphone (10 year old flip phone that I use in USA, no camera, needs a special charger as it was built before USB chargers became the norm). My cell plan does not work outside USA. I do not upgrade because my cell plan is a very affordable $80 USD per year with this phone. I do not know how to text, so the keyboard is perfectly adequate for dialing numbers.
Very happy with the above collection, have no plans to change.