Which one would you choose

Doesn't really matter as long as you keep topping any regular or feminised seed

A photoperiod plant of some sort, growing an auto in a 100 gallon pot would be pointless. In Germany, look for plants that will finish in September........."Sweet Seeds" have excellent early finishing strains, as well as "fast flowering" strains that wil finish mid September. I have grown nearly all of Sweet Seeds catalogue and all of them have performed exceptionally..........easy to grow, productive, potent and with, (most importantly), super stable genetics. You do realise 100 gallons is nearly 400 litres? You can grow 3 metre tall plants in 50 litre pots....I would not grow in anything bigger than 100 litres, but if you want to grow a plant as big as possible, you really should grow directly in the ground. While it may be "romantic" to grow big plants, in my experience, I would rather grow many smaller plants and have a large selection of buds to choose from. I have grown enourmous plants in the past, but then if you grow a strain you don't really appreciate, you end up with kilos of buds you don't want to consume, that is why these days, I plant late in the season and grow many small plants so that I have a variety of flowers to suit any occasion! This way you can sample many breeders offerings and when you find ones you really like, then next season grow those as your "special feature" plants.

I'd use what you now about the plants. A plant can look awesome in vege an dstill be less than awesome at end of flower. Don't get me wrong, picking the most robust at this stage still correlates but not a guarantee. so pick the one you know more about or just have more interest in.

100Gal, dam thats a big as pot. Pick a plant that has better characteristics your looking for. If they are the same strain I like the 2nd ones more on structure. it looks like it was topped early on and has two main growth nodes. If they are different plants then pick the one that will have better resistance to moulds and finishes faster. as I am guessing this 100Gal pot if going to be outside. Don't over feed em either they will be hard to correct or flush in 100Gallons. Good Luck!

The best answer to this is really gonna be dictated by: 1. The climate in your area- pick something that thrives in your conditions. Is it usually humid or rainy around harvest time? Pick a strain that's more mold resistant and with a shorter average flowering period. 2. Pick something you're gonna enjoy to consume. If you're growing a monster plant you're gonna have a lot of bud when finished. Target profile traits that appeal to you. Flavor, effects, etc. Don't get too caught up in sativa vs indica. Honestly there's very few "pure" strains anymore and hybridization has really opened things up where you can grow a lot of different strains. Breeders generally give good recommendations on genetics that do well outside.

My favorite strains to grow outside are all Indica leaning. I do this because Sativa always take the longest to flower and sometimes they are not even ready by the time frost is hitting. You are talking about a few weeks of time outside with an Indica vs Sativa. So my recommendation is whatever strain you have going now, to choose whatever one is more Indica leaning. Also, I would like to note that Sativa plants are usually the 10-12 foot monster plants you see on the internet. Whereas Indica will get around 6-7 feet tall in a season. I hope this helps and I really want to see this journey so hope you keep us posted.