1nz-fe would be quicker than the 5AFE mainly because of extra power that is has and the fact that the 1nz would have seen lesser miles, meaning that it would have more of its power left than the 5AFE. Yes, the 1nz-fe is lighter than the 5afe which is good for the suspension but like you said, it would raise the car from the front on your current suspension setup which would shift the weight of the car backwards and may cause stability issues but can be rectified by lowering the car from the front, which will shift the weight of the car back to the front, making it stable. With good tyres, traction wont be an issue.
About having personally experienced work in Peshawar, no, I havent had any personal experience there but generally, if you look at normally done swaps in Peshawar and compare them to Rawalpindi, you would find the Peshawar ones very slightly better than pindi but of course, that is very much dependent on the person/owner who is getting the work done. That said, the skill in Rawalpindi isnt any less than any other city if you get it done right.
At the end of the day, I would urge you to do LOTS of homework on engine swaps and then only take the plunge. The mechanics would paint a rosy picture of how the swap would be a success and that you have nothing to worry about but it takes a lot longer and a lot more effort and patience than the few initial days that the mechanic would take to swap the engine, to perfect the swap and would require a lot of input at your end. If you feel that you wont be able to do that or would get fed up with having to redo a few things at the beginning, I would suggest you to just go for a bolt on swap, which is the 5AFE. You'll just have to look for a complete and a healthy engine along with the parts that are required for the swap. It would be a cheaper swap and would be easier to troubleshoot if anything goes wrong as it has been done over and over again and people are experienced in it. It would also be at an earlier level of the learning stage and you can then build your knowledge base on this swap go for a more complex swap once you feel that you're ready.