Compare R7000P to RAX45

good afternoon,

I currently have a R6400 that has been a great router for about 2 years.  Over the past month, the internet has been dropping but reconnecting within minutes.  I blamed Spectrum at first but after monitoring the modem when the internet drops, the modem does not cycle but the router does.  I went into the router and have found dos attacks at around the time it cycles.  This morning I lost connection on my PC for about a minute.  I went into the router log and it just showed a disconnect and connect with no reason. I am beginning to think the router may be malfunctioning.  (SIGH) I have done some research and have bought 2 but will return 1.  I have in my possession a R7000P with an AC2300 and I purchased RAX45 model from Costco which is an AX6 AX4300.  Costco had a promo so it is cheaper but both have the same original costs.  Can someone tell me which unit I should keep and why?

Thank you all in advance.