In my opinion, for this training, it is better to stick with one type. The familiarity makes for a better learning environment whilst developing basic skills.
Subsequently, switching types - with due reference to the manual and/or instructor time is very good for any pilot - but that's once the basic flying skillset have been developed.
But at 10 hrs, I'd stick with the C152 unless there is any strong reason to do otherwise.
I also think that whilst the PA28 is a good touring aeroplane, it's a poor training aeroplane - most especially the very forgiving handling, benign stalling characteristics, and slightly more complex cockpit than is really needed for the basic training role. The C152 makes you work a little harder, and is lighter on the controls - that tends to create a slightly better training environment.
G