My most recent trip away was three days by car and for the first time I took my 3kg+ laptop. Usually I travel with what was almost the first of the netbooks, the eeePC 701.
So how do they compare?
Travelling by car, the hefty laptop is more convenient and there can be everything available that you'd expect at home. It'll run Windows if that's what you run at home - in fact it can be your main computer even at home, so you know how to do everything.
The down side is the weight (it would have accounted for half the total baggage for one allowed on our recent trip by air over Lake Eyre, and once you are out of the cities you realise the effect of all your regular internet checks for things like desktop gadgets (weather, shares, exchange rate etc) add to slowing up your 2G mail and other web downloads. It may be a good idea to set up a specific "user" for travelling.
So, for air, train etc I'll still go for the little netbook. Yes, the screen is too small (it is one of the original 7" screens, there are 10" ones now which would be better) but it weighs just over 900g or 1200g with mini-mouse, charger and modem and it is a third the size of the laptop.
I'm tempted by a tablet, but so far it is only temptation - and there's that additional benefit in favour of the netbook: it cost $500 but that's when they were something new and most of that value has been written off over the years. I could replace it for around $250 so its loss or damage isn't going to hit me hard (though its replacement could just possibly be a Galaxy if I have to make a decision while travelling and a store has one).
As to wireless availability, my experiences in central Australia late in 2010 still appear to be current. Something simpler such as a netbook with Linux will get and send email faster than most laptops but I can't yet compare that to a tablet, especially one of the cheaper ones running the Android OS. I never like throwing out something that is still working well, so for the time being my almost ancient netbook will be my main means of communication when away from home and office.
On this latest trip the wireless connection via our second major national carrier was excruciatingly slow - and the motel's wifi, running from a landline link, was not much faster. Perhaps when the networks get better outside of the capital cities I will give way to the tablet temptation.