i have blade techs as well, and they have worked great, no complaints. however i prefer the raven. the raven is totally modular, you can use it as an iwb, or an owb, an appendix carry, you can add other pouches to the holster etc. my blade tech iwb is nice, but i can't use it as an owb. and my awesome owb blade tech can't be used as an IWB.
additionally the ravens are much thinner(but just as durable), and better wearing, and more comfortable to conceal imho, and even worn OWB they are thinner, and flatter fitting your body. additionally the holster itself is a little wide, which helps the holster "comform" to your body size / shape etc.