I've used HS-6 also and will probably not use Titegroup again once it's finished.
Please advise if HS-6 is a good choice and if you have any other recommendations.
HS-6 is a slower burning powder meant for full power/higher velocity loads. But like most other slower burning powders, optimal powder burn and accuracy are achieved at higher charges of near max to max load data so not suitable for lighter target loads (which essentially what you are trying to do with Titegroup)
For new reloaders who tend to load lighter target loads using start/lower powder charges, many recommend W231/HP-38/Sport Pistol which are faster burning and can produce accuracy even at lower load data. There are moderately slower burning powders that are capable of producing accurate loads even at mid-range load data like BE-86 and WSF.
Titegroup is slightly faster burning than W231/HP-38/Sport Pistol but since it burns hot and violent at near max/max charges, many do not recommend it for new reloaders. BUT I do like Titegroup for 9mm as it produces greater accuracy loads compared to W231/HP-38 (I need to push 115 gr FMJ/RN to near max load data to produce accuracy). So if you are happy with Titegroup accuracy, there's no reason to switch powders, especially if you are loading lighter target loads.
If you are looking for comparable powders to Titegroup, I would suggest IMR Target, Accurate No 2, Vhitavuori N320, Alliant Sport Pistol along with Winchester 231/Hodgdon HP-38 (same powder).
Look at the following groups of powders I clustered from faster burning to slower burning and if you are wanting to load lighter 9mm target loads, you want to use powders in the Red Dot/Promo to W231/HP-38/Sport Pistol burn rate range -
https://www.thehighroad.org/index.p...-and-discussions.778197/page-10#post-10966508
If you want to load higher velocity loads, W244/Unique/Universal/Unequal to HS-6/CFE Pistol/AutoComp are better suited 9mm powders.
Faster burning pistol powders:
E3 - Competition - Nitro 100 - N310 - Norma R1
Red Dot/Promo - IMR Red - Clays - 700X - Bullseye - Vectan Ba 10 - IMR Target - TiteGroup - Vectan AS - Am. Select - Solo 1000 - WST - International - Trail Boss - N320 - Vectan Ba 9.5 - No. 2 - Clean Shot/Lovex D032.03
W231/HP-38 - Zip - Sport Pistol - Green Dot - IMR Green - W244
Slower burning pistol powders:
Unique - Universal - IMR Unequal - Vectan Ba 9 - BE-86 - Power Pistol - N330 - Vectan A1 - Herco - Vectan A0 - WSF - N340 - 800X
No. 5 - Auto Pistol/Lovex D036-03 - True Blue - HS6 - AutoComp - Ultimate Pistol/Lovex D036-07 - CFE Pistol - Silhouette - 3N37
N350 - 3N38 - IMR Blue - W572 - Blue Dot - No. 7 - Major Pistol/Lovex D037-01 - Vectan Ba 7.5 - Pro Reach - Long Shot - 2400
Enforcer - No. 9 - Heavy Pistol/Lovex D037-02 - 4100 - Steel - Norma R123 - N110 - Lil'Gun - W296/H110 - 300-MP - 11FS - Vectan Ba 6.5 - H4227