I've grown them outside - but we are in west Wales which is fairly mild, and it does depend on the summer. You don't get anywhere near the crop that you get in a tunnel/greenhouse, but the flip side is that they are less inclined to get mildew. IMO I would say more that I get many fewer fruits, rather than them being tiny.
TBH if I wasn't doing it for work I wouldn't bother with them if I didn't have an indoor space, especially since you need to get them to a decent size before planting out which is really hard on a windowsill.
The two I've had most success with outside are De Barbentane, and Morden Midget, but I've never tried Moneymaker.