Proof of Work is the only known rock solid consensus mechanism that does not require external "fiddling" such as checkpoints, oracles, etc. I wouldn¡'t touch PoS with a stick.
If QT is too heave, get Electrum.
Which POS?
I know Peercoin's POS system uses centralized checkpoints. Does NXT also use them?
Bitcoin is like 10000x times more used, thats why it syncs slower than all others...
Actually it syncs pretty fast from scratch, in a couple of hours or so. Whereas something like Monero for example takes weeks.
I also synced NXT from scratch last week, it took way longer than Bitcoin-QT core 0.10.2 wallet.
Like Datacoin, Monero is a bit of a special case since the CryptoNote technology results in a much larger blockchain than you'd expect for a coin of its size.
Last time I checked, the Bitcoin blockchain was roughly 30 GB in size while NXT's was slightly over 400 MB. Has the syncing speed improved in the latest version of the Bitcoin-Qt client? Because I remember I could never get my Internet connection to sync with the Bitcoin blockchain no matter how long I waited whereas syncing with NXT's was always fairly quick in comparison.
