You should be more specific when you were starting your thread and mention do you compare them in all product areas or only smartphones for example.
As you haven't been more specific I will consider that your question is general compare between LG and Samsung.
In technical, they are not much different. There are not big differences in product specs and their performance. However my vote goes to LG and this is why.
* Failure and malfunctions can be seen at Samsung way more often than the LG.
* Price of the Samsung products is always higher than the LG and it does not reflect products quality but brand only.