I would have thought that would be the opposite, what variety are you growing ?

What were you feeding your greenhouse ones, and how often? And what did you feed the outside ones and how often?

I agree, I thought they would be better inside Tulsalady. Moneymaker, a cherry variety and beefeater ( a large one).
Bamboo, I feed them on tomorite weekly,I keep them well watered and warm. The outdoor ones although in a good soil with plenty of rotted muck have been left to their own devises and they are cropping heavily.
It seems I have asked this question twice, I lost my line and thought my question had gone with it.

they are both indoor variety so that's weird. must be the muck. lol

Is the greenhouse white washed? Tomatoes need a certain amount of sun to produce flowers.
Have you been tapping the flowers every morning to pollinate them? If bees can't get into the greenhouse, the plants might produce flowers, but no fruit will form.
Are the plants wilting between waterings? Watering tomatoes is a preemptive strike--if you let them wilt, you will have all kinds of problems, from abortion of flowers and young fruit, to blossom end rot on the ones that survive.

Thanks Tugbrethil, It is shaded a little, but I havent been tapping them. They dont wilt between waterings and the door is kept wide open during the day.They are much more spindly than the outdoor ones which are robust.

Living where you do I wouldn't consider growing tomatoes in the greenhouse they will normally crop better outdoors. We have no choice as weather isn't really warm enough.

Spindly may just mean that they aren't getting pushed around by the wind, which thickens the stems, or it may mean that they are shaded more than you think, or it may mean a nitrogen deficiency. I know that we use more nitrogen here in the desert than gardeners in the UK do, but it does have an indirect influence on bearing. They may not need much more nitrogen, but a dose of fish emulsion might be a good experiment.

Well there's another explanation, although doesn't take account of the fact your pots might not be big enough for the greenhouse ones - your soil outside is obviously in very good nick. Thing about growing in the ground is, there's a whole host of micro organisms doing all kinds of stuff in the soil, and if you've added humus rich material, there'll be lots of activity of that ilk. Your tomatoes also have the advantage of being able to spread their roots far and wide to seek out nutrients and water, and it sounds like plenty of the right nutrients were freely available. Unlimited access to sunlight and air helps too.

Agree Bamboo!

Me too! I'm nowhere NEAR as knowledgeable about growing stuff as you guys, but I'd rather have my veggies growing outside in the earth, sunshine and anything else that floats their boats!