What are you using it for? That should be your first question in deciding if you'll be buying a laptop or desktop.
Second question: do you like/want to do upgrades, or do you want to just buy something new when vid card dies or RAM needs an upgrade?
If you just like to poke around the internet and don't want to bother with upgrades, go laptop (or just use your phone or tablet, honestly)
If you want to do gaming, or will use it in one spot 90+% of the time, and/or you want to do your own upgrades, desktop.
(You could also consider a raspberry pi, keyboard, mouse, and portable monitor/display, but that would be more if you're mostly working in one spot but really do need to move locations from time to time.)
And always keep in mind - if the product is incredibly cheap but runs pretty well, you are what they're really selling (Lenovo, for example)
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