LG Optimus One vs HTC Wildfire S

I have an LG Optimus One which I bought new on pay as you go. I've had nothing but problems with it, from it restarting, turning itself off, calls being cut off, texts not coming through, the SD card becoming unmounted, and other stuff.

A friend is selling a new unused Wildfire S, and am considering buying it, depending on how much she wants for it.

Is it worth doing? Or should I just hold on to the Optimus One and save up to buy a higher spec phone?

Thanks.