We are not familiar with the products you are going to purchase. We like the Wall-o-Waters ourselves. They work great for heat retention on cold nights but still the plants grow fine on warm days with them still around the plants. Maybe you should try more than one method and compare the results.

We prefer for our tomato plants to be older than 6 weeks old when we put them out. I realize many 'experts' state not to grow your tomatoes larger but we do with good results. You need to transplant them while indoors to deeper and bigger pots but the results are worth the effort. We didn't buy any tomatoes last year after mid-May because we had enough of our own. We use 16oz. Solo Party cups with holes in the bottoms for the next size transplant pot after the small cell-packs. They give the plant the depth needed. Plant them right up to 'their necks, burying the stem and often a set of leaves. Do this in both the pots and in the final planting spot. Roots develop all along the stem which creates a stronger plant.

While your plants are indoors you will need to provide food, good strong light, a fan for good air circulation, and maybe milled sphagnum moss to fight 'damping off', a common problem with growing indoors.

Hope this helps,
Diane