For rubber powered planes Sig is a much better choice.  Gillows models tend to be heavy.  Buy if you have a larger model in mind, then a larger kit would have a design that is closer to what you will be using.  If you will be flying it RC then I would build a trainer because you will need to know how to fly this model.  If this is going to be a small electric model then a small electric trainer such as the Super Cub perhaps.  If a larger glow model then perhaps the Sig LT-40 trainer.