There seems to be 3 laptops at PC World that run the AMD E1 - and each has a different "number" after it - AMD E1-1500, AMD E1-2100, AMD E1-2500.
I assume the 1500 is the slowest and the 2500 is the fastest.
However it should be noted that both the AMD E1 and the Intel Celeron are the budget, entry level, low end (ie slow) CPUs and are both probably best avoided.
The thing with CPUs for laptops is that there is a trade off between CPU performance and battery life.
If a laptop CPU is powerful and performs well then it will run the battery down quickly.
If you want long battery life then you need a low powered CPU that prolongs battery life but the CPU/Laptop runs slower.
So if you plan to spend a lot of time with this laptop in the HOUSE and plugged in to the mains then go for a more powerful CPU.
If you plan to use this laptop away from the house, where it cant be plugged into the mains, then these will have a long battery life but probably be slow.
You really do get what you pay for in a laptop.
If you buy a cheap laptop then you get a poor, slow, low end CPU, spend a bit more money and you probably get a better CPU and faster performance.