Is there any advantages that I am missing here, compared to Chipmixer, Samourai and Wasabi wallets?
Both Samourai and Wasabi wallet are more transparent and you have full control your Bitcoin all the time. I would use both over any kinds of mixer.
I think you miss the part all SPV wallets cant be used alone when security/anonymity is the top priority and with the statement made by CipherTrace, chain analysis, etc I think people need to be more careful when using SPV wallet. Mind you, the shortcoming detected about Wasabi that a large amount of transaction can be bypass and I once a thread where Theymos advise the use of a mixer and SPV wallet when anonymity is the top priority.
I don't remember technical detail of Samourai, but Wasabi:
1. Uses Tor by default
2. Uses BIP 157/neutrino which improve privacy of SPV wallet
3. Will use your own full node (if you run one)
Don't compare Wasabi with other SPV wallet such as Electrum.
I totally know how Wasabi wallet operate and I dont compare it either with other SPV wallet cause they are not using the same technology to provide there service but you saying you'll use both Samourai and Wasabi over any kinds of mixer is the reason why I said in a situation when anonymity is important it not advisable to use only SPV wallet cause there are some information that the UTXO of privacy wallet can be breach what was said by
.