depends on what you want to do. I prefer IBM's as I despise touchpads with every ounce of my being. They make document work so much more difficult because you have to take your hands off of the home keys to move the mouse... Some of them are also built with metal frames which the vast majority of other laptops out there don't have. I've dropped my T61 on the corner on tiles and it just flopped over and was fine. Do that with most others and it will shatter the screen.
With the new Thinkpad tablet out though, that is probably the best new technology on the market as far as computers. It is an android tablet, but has external full size USB port *none of the other tablets have that, so no using thumb drives*, and with the optional keyboard folio, it will dock into this folio and have a full size keyboard with trackpoint mouse that is hardwired into the tablet, so no fighting wireless connections. All of that folds up into the form factor of a 10 inch notebook, but for under $700 you get a full functioning notebook with the added benefit of the touchscreen and tablet features. It also has a full size SD slot for expandable memory and a SIM card slot so you can use 3g. I love mine and use it far more than my laptop. It won't run the same kinds of programs that the laptop will, i.e. if you're a gamer this is obviously not for you, and it doesn't have a whole lot of harddrive space. I have the 32gb model which is plenty because any native stuff it needs will fit there, I have the SD card slot for expansion and the USB port allows me to hook up an external HDD with any pictures and what not on there. So for under $800 you have a 1tb external HDD to store stuff, a tablet, digitizer pen *this is awesome because it allows you to scribble on the screen, which none of the other tablets are offering at the moment, it will also convert writing to text* and the keyboard folio. It's a bit more than what you can buy an off the shelf laptop from best buy for, but the versatility is astounding