What games are you more interested that are coming soon for both consoles? I feel like despite the Switch shortages that will help you determine your answer quicker.
Depends on what other consoles you own or if you have a powerful gaming PC. If you do, get a Switch and play 3rd party games on PC or Xbox. If you don't have an Xbox or powerful PC, get the PS4.
Also, price difference isn't surprising. Nintendo released Switch after adjusting for the fall in price of currency due to Brexit. PS4 is still priced similar to the currency exchange rate of 2 to 3 years ago.
What do you currently play games on? If you don't have a current gen PC, definitely get a PS4 so you can play most games coming out. If you do have a PC, its up to you if you want PS4 or Switch exclusive games more.
What exclusives interest you more?
Sony and Nintendo are quality in that aspect. Can't really go wrong with either. Sony just has much more right now. Probably the biggest thing separating both right now