Which Tolkien Book First?Watch
Unfinished tales are a lot easier and relaxing to read - whereas Silmarillion is rather hard going! If you want to relax beforehand then read Unfinished tales first - or if you want to relax after reading Simarillion then read that first! Both are great books but I particuarly loved the Unfinished Tales. Have fun reading!
The Silmarillion before Unfinished Tales.
I found the Simarillion quite hard to get into, it is really heavy going.
If you want the context the Silmarillion gives on how many parts of the world became how they are, read the Silmarillion first.
If you just want to enjoy some stories before "studying" Middle earth's origins, read the Unfinished Tales First.