I agree with this 100%. If you're not interested in spending a lot of money on older tamas, mainly the connection models and older modern models, then I would recommend Uni. I personally prefer it to the Pix mainly because it's easy to care for and it has plenty of content to engage with, especially since it gets updates through WiFi. That and it having actual buttons makes it much easier to use.
The P2 is also totally worth checking out since you enjoyed the P1. It's functionally the same, but the characters and mini game are different. Another good vintage option would be the Angelgotchi. It did have an English release, but the Japanese releases are generally much cheaper/easier to find. Since the vintage models don't have a ton of text to begin with, it's still quite easy to navigate the Japanese ones. That and there's plenty of guides online and here on Tamatalk.
Hope you find a new addition for your tama collection!