I would definitely go for TAG as these are the best Ottoman figures on the market IMHO : they'd also match well with Foundry swashbucklers size-wize .
I'm generally not fond of Old Glory and certainly wouldn't claim objectivity here, but the few OG samples I've seen are not too bad - certainly better than many other OG ranges, which in itself is no great achievement. Obviously, that does not mean you don't get the obligatory contingent of gawky "Hey Steve !" poses with weird head angles without which Old Glory would not be Old Glory.
The Redoubt Ottoman Turks are probably beginning to show their age by now : are they actually that tall ? They can't be as huge as the Redoubt Wellington in India figures, certainly. Detail probably wouldn't as crisp as on the TAG range though, and Redoubt horses have always been somewhat sub-par.