Bart, the primary difference in the grapes you mention is your wine grapes are pure vinafera and the table grapes are hybrid vinafera/american. There is some difference in table vs wine but the vinafera/hybrid difference is bigger. Most hybrid grapes are much more resistant to diseases but it does vary from variety to variety. I am a primarily organic grower and I found vinafera a huge pain which took up way too much of my time so I pulled out my wine grapes this spring. I now have primarily hybrids and just a couple vinafera table grapes. Usually by now I have had to do 4-5 sprays but this year I have done only one and the grapes still look fine (even the couple vinafera look fine - their neighbors are all un-diseased and that must help). So, a rough guide is half or fewer sprays are needed; save your tank leftovers for them. As far as pruning goes I used the same for all types but I am not in to all of the subtle stuff of grape pruning. Some table varieties are considered better pruned to canes and other pruned to spurs, but I always used spur pruning for all my grapes. Scott

As for the trellis question, I am a big believer in a simple vertical trellis with about 5 wires. My trellis is about 6 feet tall at the top wire with another wire each drop of 8 inches. I train the canes horizontally along the second to the bottom wire, and bend the ends to tie to the lowest wire. This encourages re growth at the main trunk as opposed to the shoot tip. Spacing should be at least 6 feet apart for most varieties and the rows about 8 feet to get a mower through the row. As for the flavor, so far it is holding out. I do have some VE types that go 'flat', so if you are in a warmer part of the US, avoid the VE grapes...unless you want one for raisins.

I haven't tried to cross any grapes myself. I did buy and plant a Tomcord from Starks Bros. Nursery. Supposedly a cross of the thompson seedless and concord. I planted it already leafed out when the ground was still cold. It just sat there. When the ground warmed up it really took off. It seemed to be very disease resistant.

Are they seeded/seedless? You mentioned the flavor of one parent being stronger than that of the other...which does the hybrid resemble most? I bought a very tasty Muscat canelli (2008) dessert wine at the Ste. Michelle Winery in Woodinville. Unfortunately, it is available only at the winery.