Shouldn't matter any more than the color of the paint in your listening room. A generalization based on the experiences of one or two individuals, most likely.
A properly ported woofer COULD be more efficient, and might actually be a BETTER match for tubes, since it COULD take more power to get satisfying bass from a sealed speaker, which COULD be lacking with a tube amp. The ported speaker COULD have been ported to "help" frequency response, though, which COULD sound bloated with a tube amp that lacks power and or control, or is described as having lots of "bloom" or a "tubey" sound.
Of course this COULD be the total opposite if you pick just the right amp and speaker combo. You need to be more specific about what amp and speakers you are considering and I'm sure someone will chime in.
A properly ported woofer COULD be more efficient, and might actually be a BETTER match for tubes, since it COULD take more power to get satisfying bass from a sealed speaker, which COULD be lacking with a tube amp. The ported speaker COULD have been ported to "help" frequency response, though, which COULD sound bloated with a tube amp that lacks power and or control, or is described as having lots of "bloom" or a "tubey" sound.
Of course this COULD be the total opposite if you pick just the right amp and speaker combo. You need to be more specific about what amp and speakers you are considering and I'm sure someone will chime in.