In my opinion, the way in which one loses weight, as long as it's healthy, is complete personal choice and one should be applauded for making a positive decision for a
healthier lifestyle.
We could argue all day about the good and bad points of all diets. The bottom line is the ONLY way to lose weight is to burn more calories than you are taking in (having a calorific deficit). Weight Watchers, Slimming World, TFR diets and so on all do this, but in different ways.
For each individual it's a choice, whether you are looking for a plan to change your life - that you can stick to for life, or whether you just want to lose a bit of weight and then change your eating habbits thereafter.
As most people on here know I am a lifelong fan of SW and havn't tried WW, but it's not my place to judge someone else choice of making a positive decision to lose weight.
With regards to the original post;
How can something like pasta n' sauce from batchelors be free on SW extra easy, but on weight watchers if i was to eat a whole pack it would be almost half my allowed points for the day?
As others have mentioned, if you want to 'change diets' then you have to be in the mind set of the current plan you are following, try not to compare.
As I said before WW and SW have different ways of helping you achieve a calorific deficit. For example with WW products I notice the points are written on the packaging. Where a WW cake may be 1 point, therefore not a huge amount from your daily allowance (apologies I don't know the plan, nor the number of points allowed) it may be that the same product is 8 of your 15 daily 'syns'.
Good luck with SW
Natt xxx
P.S. Sorry for the long post!