Guys,

Thank you for answers. But i still have to determine which of these costs mentioned above are better. Let's look on Query 1

having similar times what is better?. When...

@GilaMonster . Thanks a lot for links. I've read a lots of articles but not these mentioned by you. Generally very good and usefull. But..... 🙂

These articles answer perfectly for...

Guys don't leave me i am stuck i really need your help 🙂 i was trying to find an answer in the net but withour results 🙁