Please keep us posted. I currently do quite a lot of monitoring on this band (mainly weather sensors) using SDR with standard antenna (not ideal), I also ordered a few nice 433 Mhz Lora modules. However it seems for LoraWAN we currently need 868 (or 915 for US / region 2) as most currently available gateways (Multitec, Kerlink, Lorank) only support these higher bands AFAIK? Although there is a promise that the TTN gateway will support also 433 MHz. I'm not sure if this statement is authorized by the TTN team.
Also in the Netherlands the max allowed power is 25 mW on 868 and only 10 mW in 434 MHz (500 mW on 869.4), see AT which would be in favor of 868 MHz (although penetration/absorption is less favorable at higher frequencies off course, not sure how much this will effect Lora technology). But as they say in Dutch: meten is weten 