Which wallet is the best and why?
The best place to start looking is the official choose-your-wallet page here: https://bitcoin.org/en/choose-your-wallet
There's also a beginner-friendly chart that I've put up here which might be helpful: http://gurnec.github.io/btc-wallet-comparison. If you have any questions on why I rated something the way I did on that chart, just ask.
I'm using bitcoin core, but pisses me off because it is using 24gb on my SSD 
can we move bitcoin transaction data to hdd drive?i want to try bitcoin core, but 24 GB in my ssd are really waste of space
i can install 3-4 good games with that amount of spaces
Yes. Before starting Bitcoin Core for the first time, create a new folder on an alternate drive, and then modify the shortcut in the start menu (right-click, properties) so that the Target includes the newly created folder, like this:
Code:
"C:\Program Files\Bitcoin\bitcoin-qt.exe" -datadir=D:\Bitcoin
Also, by placing a "bootstrap" file into this folder before staring Bitcoin for the first time, you can significantly speed up the initial download process (from days to hours). This bootstrap file can be downloaded via BitTorrent with this torrent: https://s3.amazonaws.com/bitcoinarmory-media/bootstrap.dat.torrent.
Thank you, but unfortunately this does not help me because I have only SSD in my laptop.