Hi i am looking to buy yearly subscription for either wordze.com or keyworddiscovery.com ... my concern here is can i share the account with someone else also ? so we can share money or its not allowed ??/
Wordze does NOT have account locking like the others do. You can share your account with a couple people without having to worry about getting locked out.
Try using KeywordSpy it will help you know what keywords your competitors are using and how it generates money for them, you can use those keywords to drive traffic to your site and give your business the exposure it needs. It offers Free trials. It goes with a ClickBank Affiliates Search Engine where you can see the actual market landscape at ClickBank.
I just tried Wordze last night (with the one day acc) and I think the overall experience is quite good. I havn't used Keyword Discovery before but I have accessed to it through Nichebot. But I will give a vote to Wordze.
For keywords research I can recommend you seodigger.com, just trace your competitors keywords and positions in SERP, they've done all the work allready .