This is with reference to previous reply by sHEIKHRULZZZ where I believe that he has answered all your question. Lead Acid battery is best for cars as it can deliver very high current for short period of time which is a typical requirement during the startup of a car. By Cranking the car battery means that amount of Ampers which a car battery can deliver once both the terminals have been made short which is similar to what happens during startup but not exact.
Alternately if you are buying a set of batteries for UPS then consider buying a Deep Cycle Battery which is made up of zinc-bromide which provides more backup time. The main difference between the Car battery and Deep Cycle Battery are
1) Car battery can provide very high current for short duration of time
2) Backup time is less then Deep Cycle Battery
3) Car battery requires charging once it has been discharged by 80 % where once terminal Voltage reaches 12.8 Volts then the battery is considered fully charged and once voltage drops below 10.24 Volts then it will require immediate charging as it won’t be able to recover back if further delayed.
4) Shorter Life.
5) Low price as compared to Deep Cycle Battery.
Deep Cycle Battery
1) Cannot provide a very high Current for Short duration of time
2) Provides stable current for longer duration of time so this is very suitable for UPS applications
3) Can be discharged till 50 % and even then can recover back.
4) Needs less maintenance
5) Normally used in Homes where Solar Panels are installed and backup is stored in Deep Cycle Batteries & then it will provide you with enough backup for your entire night.
6) Longer life, more backup, less maintenance.
7) Higher Price
Coming back to your original question that which battery is best for use in Cars? where I believe that all the batteries available in Pakistan are of Lead-Acid type. It does not matter which brand you buy as the basic principal behind manufacturing is same so buy any brand from any manufacturer (Volta, Oxide, AGS, Osaka, Phenix) and maintain them well which is a key to longer life. Rest Volta over Oxide, AGS over Volta, Every other brand over Phenix is just a marketing strategy.