I generally prefer ARKW as a compliment to VGT (TSLA, AMZN, FB are not included in VGT), but both ARKK and ARKW are good and have a reasonable record of outperformance. At the moment, I’m not invested in either of them though.
To get best of both worlds, one could also consider combining ARKW with ARKG, there is no overlap.
https://ark-funds.com/arkw
https://ark-funds.com/arkg