Before buying this jug, I did a lot of research because I already had several jugs (and also, I am quite fussy!). I was looking for a jug which would look good and modern as I was planning to keep it out of the fridge. I wanted one which could be easily cleaned and would have a lid to keep dust and small insects out.
I first bought the 1.5 litre jug but exchanged it for the 1 litre, so I have seen both. I also want to say that the company were totally brilliant about the exchange, extra quick, no quibble and really helpful - I actually got the 2nd jug on the day the first one had been scheduled to be delivered!
I first bought the 1.5 litre and found that was also a beautiful jug but it was quite heavy for me when full and I needed both hands to pour, especially as the diameter is wider than the one litre model.
I can hold the 1 litre jug easily in one hand and I also find that one litre capacity is reasonable, you don't have to fill it up too often.
In deciding about the size, I would also say that if you're not sure which one to buy between the 1 litre and the 1.5 litre, something else worth considering is the size of your kitchen (or room, or table where you intend to use it). I have a medium size kitchen and the 1 litre looks perfect in it whereas the 1.5 litre did look a bit oversized. I also read a review of a lady who had bought the one litre jug and had a large kitchen and she said she regretted not buying the larger model as it would have looked better in her large room...
I hope this helps.