@Nabeel
First of all, congratulations on making it to these schools. I was faced with the same situation last year before I took up the MBA in IM @ HS Pforzheim.
Will mention a few things which might help you to decide in a better manner. I see that you have talked about the placements, the German language course, the fees among other things.
1. HS Pforzheim costs a little more than half the course fees which GISMA demands. It will help if you do the math here. You will for sure take up a German language course externally which will cost you over and above the fees for GISMA. Please do your research on such language courses and how much do they cost, which otherwise are offered for free in HS Pforzheim throughout the length of the MBA course.
2. Looking at the language course alone as a decisive factor - Assuming that you have already completed your A1 from Pakistan, you will have the opportunity of elevating yourself at a level more than B1 by the end of your MBA semesters. The courses will be stretched out comfortably along with informal German speaking meetings every semester. This works out far better than a month long extensive course, where you dont end up speaking fluently. I do not need to emphasize more on how the language helps in a job hunt and subsequent interviews.
3. Placements - Looking at both the courses purely from the ROE perspective, I can easily claim that HS Pforzheim works brilliant. I am not aware of how you will be financing yourself, but in case you are on a student loan - please bear in mind that a considerable part of your post MBA income every month will be spent on repaying your education loan which will be higher in case of GISMA. I have mentioned this before in many of the threads regarding HS Pforzheim that the alumni which consisted of mostly non German and non EU students have found employment in Germany and EU with ease and with major companies like HSBC, Cisco, Oracle, BASF, KPMG, Daimler, Toyota, Bosch, Infosys, Henkel, Continental etc. We have an impressive record with the hidden champions as well.
The school website just mentions the companies that have hired our students in the past and does not have a placement report. Let me know what you are referring to, when you say a placement report. The statistics could be flawed if it is not coming from the school itself.
Wishing you all the luck with whatever you decide to go ahead with. A great time in Germany awaits you.