Choosing a digital pen?

Question

Iron

I'm going to buy a digital pen. I formulated the following criteria:
1. Comfortable to hold in hand
2. Without a tablet, write directly on paper
3. Support for linux
Wacom Inkling does not seem to be suitable, because no support for linux (as well as the price of 9-10k).
Of the rest, I like Ritmix DP-205 BT or Ritmix DP-305i . And both somehow support linux .
But I don't understand what is the difference between them. the price is the same up to a ruble, and the DP-205 BT has bluetooth. What's the catch?
I would be grateful if:
a) You will advise me a pen, the experience of using which you have
b) Tell me how the two above described differ

Answer 1

b) “Actually, there are two pens, one with support for Bluetooth connection (DP205BT), and the second one with support for iPhone / iPad (DP305i). Prices are about 3 thousand for each. The review from which the quote is taken.