Brother, general prize bonds aap jub marzi, jiss marzi jagha sey ley lein (like banks, national savings centers, dealers in market, etc. but subject to availability) and jub marzi wapis kar dein; you have full freedom and inki trading mein financial loss / ghaata koi nai. But yes, ye ussi k hotay hain jiss k paas hoon. Agar Khuda Na Khawasta, gumm ya choori ho jyein, aap kuj nai kar saktay.
On the other hand, premium prize bonds are issued on the name of investor(s) and they are his property, agar gumm ya choori ho jyein, then new bonds can be issued by SBP (but I do not know the penalty charges), so I think they are more secure. Secondly, you get some profit on premiuim prize bonds after every 06 months, dusray waloon k case mein aesa nai hota! SBP mein ye issue karwanay k liay aapka Non-Islamic Bank Account and its account maintenance certificate hona zruri hai, since the prize money / profit is directly transferred in the account. For further details, please visit: http://savings.gov.pk/premium-prize-bond/ You can also visit SBP / National savings Centers for getting complete details or call on their nos.
I do not know whether premium prize bonds can be sold or not, or they are transferable (like general ones). You need to check details from concerned office(s).
There are no US Dollars Prize Bonds as of now!
And Yes, an important thing, woi prize bonds (irrespective general / premium) draw mein shamil hotay hain, jinnki issuance date, uss draw date sey 02 months pehlay ki ho! Like agar draw 10-September-2018 ko hai, then woi prize bonds draw k liay eligible hoon gey jinnki issuance date 10-July-2018 sey pehlay ki ho.