As a general rule, all bikes in Pakistan other than Honda, Suzuki, and Yamaha are of relatively inferior quality. While Honda, Suzuki, and Yamaha available here in Pakistan may not offer quality at par with international standards, yet they are better than local motor bike brands in Pakistan.
So I would suggest you to try to go for one of these. Honda CD 100 and Suzuki 110 (Sprinter Eco, Raider, GD) are good candidates in the 100cc category. They are all quality products.
If it's a must that you buy UD100 or Habib Stryker, anyone who has used them may suggest which one to choose among the two.
Good luck! Do share photos when you make your purchase.