Me and DH did a shop at a 'budget store's which saved us a lot of money on basic presents for DD i.e. a puppet theatre set up for 12.99. Combined with buying big brands on eBay (build a Bear clothes, board games) and with a main present of £100, I will have spent around £250 on DD who is 4.
DS has wanted a 4K TV for a few years and this year is the year it's the only thing that makes sense having got a new pro scooter and BMX for previous birthday and Xmas etc. I have found a good size 4k TV for £250. There is no way that I would not get him more presents so getting him decent at that teenagers like (a good watch, computer games etc) I think I will spend another £100-150 on him.
So after that long winded post, I have slight Mum guilt that I will be spending less on DD but probably about the same as what I spent on DS at her age. Also reasoning with myself that when DD is a teen, DS will be an adult with his own income etc. so won't expect TVs etc for Xmas anymore.